AU585053B2 - Creación de Inventos y Patentes con Inteligencia Artificial

AU585053B2 – Process for producing polyethylene articles having a high tensile strength and modulus
– Google Patents

AU585053B2 – Process for producing polyethylene articles having a high tensile strength and modulus
– Google Patents
Process for producing polyethylene articles having a high tensile strength and modulus

Info

Publication number
AU585053B2

AU585053B2
AU61587/86A
AU6158786A
AU585053B2
AU 585053 B2
AU585053 B2
AU 585053B2
AU 61587/86 A
AU61587/86 A
AU 61587/86A
AU 6158786 A
AU6158786 A
AU 6158786A
AU 585053 B2
AU585053 B2
AU 585053B2
Authority
AU
Australia
Prior art keywords
modulus
article
tensile strength
high tensile
producing polyethylene
Prior art date
1985-08-21
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Ceased

Application number
AU61587/86A
Other versions

AU6158786A
(en

Inventor
Cornelis Wilhelmus Maria Bastiaansen
Pieter Jan Lemstra
Lambert Henry Theodoor Van Unen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Stamicarbon BV

Original Assignee
Stamicarbon BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1985-08-21
Filing date
1986-08-19
Publication date
1989-06-08

1986-08-19
Application filed by Stamicarbon BV
filed
Critical
Stamicarbon BV

1987-02-26
Publication of AU6158786A
publication
Critical
patent/AU6158786A/en

1989-06-08
Application granted
granted
Critical

1989-06-08
Publication of AU585053B2
publication
Critical
patent/AU585053B2/en

2006-08-19
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

C—CHEMISTRY; METALLURGY

C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON

C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H

C08J3/00—Processes of treating or compounding macromolecular substances

C08J3/28—Treatment by wave energy or particle radiation

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING

B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 – B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

B29B13/00—Conditioning or physical treatment of the material to be shaped

B29B13/08—Conditioning or physical treatment of the material to be shaped by using wave energy or particle radiation

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

B29B9/00—Making granules

B29B9/16—Auxiliary treatment of granules

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING

B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING

B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor

B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING

B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor

B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets

B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique

B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed

B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING

B29C67/00—Shaping techniques not covered by groups B29C39/00 – B29C65/00, B29C70/00 or B29C73/00

B29C67/24—Shaping techniques not covered by groups B29C39/00 – B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material

C—CHEMISTRY; METALLURGY

C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON

C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H

C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances

C08J5/18—Manufacture of films or sheets

C—CHEMISTRY; METALLURGY

C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON

C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS

C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers

C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment

C08L23/04—Homopolymers or copolymers of ethene

C08L23/06—Polyethene

D—TEXTILES; PAPER

D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING

D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS

D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof

D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds

D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING

B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor

B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould

B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation

B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation

B29C2035/0877—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays

B—PERFORMING OPERATIONS; TRANSPORTING

B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL

B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material

B29K2023/04—Polymers of ethylene

B29K2023/06—PE, i.e. polyethylene

B29K2023/0658—PE, i.e. polyethylene characterised by its molecular weight

B29K2023/0683—UHMWPE, i.e. ultra high molecular weight polyethylene

C—CHEMISTRY; METALLURGY

C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON

C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H

C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers

C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment

C08J2323/04—Homopolymers or copolymers of ethene

C08J2323/06—Polyethene

Abstract

High strength and modulus articles, such as filaments, fibers, tapes, films, tubes, bars or profiles, are prepared by irradiating a solid, particular, lamellar, disentangled polyethylene with a Mw ≧ 4 × 10⁵, transforming this polyethylene above the melt temperature into an article, cooling said article to below the melting point and stretching it in several steps at rising temperature but below the melting point of the article.Advantages are i.a. the lower costs compared with the known processes, such as solid state extrusion or thermoreversible gelation.

AU61587/86A
1985-08-21
1986-08-19
Process for producing polyethylene articles having a high tensile strength and modulus

Ceased

AU585053B2
(en)

Applications Claiming Priority (2)

Application Number
Priority Date
Filing Date
Title

NL8502298

1985-08-21

NL8502298A

NL8502298A
(en)

1985-08-21
1985-08-21

PROCESS FOR MANUFACTURING HIGH TENSILE STRENGTH AND MODULUS POLYETHYLENE ARTICLES.

Publications (2)

Publication Number
Publication Date

AU6158786A

AU6158786A
(en)

1987-02-26

AU585053B2
true

AU585053B2
(en)

1989-06-08

Family
ID=19846445
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU61587/86A
Ceased

AU585053B2
(en)

1985-08-21
1986-08-19
Process for producing polyethylene articles having a high tensile strength and modulus

Country Status (13)

Country
Link

US
(1)

US4888141A
(en)

EP
(1)

EP0215507B1
(en)

JP
(1)

JPS6248527A
(en)

KR
(1)

KR900004839B1
(en)

AT
(1)

ATE47814T1
(en)

AU
(1)

AU585053B2
(en)

BR
(1)

BR8603956A
(en)

CA
(1)

CA1275637C
(en)

DE
(1)

DE3666787D1
(en)

ES
(1)

ES2001236A6
(en)

IN
(1)

IN167813B
(en)

NL
(1)

NL8502298A
(en)

ZA
(1)

ZA866253B
(en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

NL8701219A
(en)

1987-05-22
1988-12-16
Stamicarbon

METHOD FOR PREPARING AN ULTRA-STRETCHABLE POLYMER MATERIAL, ULTRA-STRETCHABLE POLYMER MATERIAL, AND METHOD FOR MANUFACTURING ARTICLES

NL8801426A
(en)

1988-06-03
1990-01-02
Stamicarbon

METHOD AND APPARATUS FOR MANUFACTURING ENDLESS ARTICLES

US5047446A
(en)

1988-07-22
1991-09-10
Himont Incorporated
Thermal treatment of irradiated propylene polymer material

NL9001745A
(en)

1990-08-01
1992-03-02
Stamicarbon

SOLUTION OF ULTRA-HIGH MOLECULAR POLYETHENE.

NL9001847A
(en)

1990-08-21
1992-03-16
Stamicarbon

POLYETHENE PROSTHESIS FILLED WITH AN INORGANIC FILLER.

US5514822A
(en)

1991-12-13
1996-05-07
Symetrix Corporation
Precursors and processes for making metal oxides

US5505900A
(en)

1993-07-09
1996-04-09
Suwanda; Dedo
Continuous process for manufacture of crosslinked, oriented polyethylene extrudates

US8865788B2
(en)

1996-02-13
2014-10-21
The General Hospital Corporation
Radiation and melt treated ultra high molecular weight polyethylene prosthetic devices

US8563623B2
(en)

1996-02-13
2013-10-22
The General Hospital Corporation
Radiation melt treated ultra high molecular weight polyethylene prosthetic devices

US5749214A
(en)

1996-10-04
1998-05-12
Cook; Roger B.
Braided or twisted line

US6121413A
(en)

1999-04-30
2000-09-19
Burstein; Albert H.
Heat treatment of ultra high molecular weight polyethylene

US7243686B2
(en)

2000-06-12
2007-07-17
Bhp Billiton Petroleum Pty. Limited
Hose

CN100368173C
(en)

2001-10-12
2008-02-13
斯蒂茨丁荷兰聚合物学会
Process to sinter ultra high molecular weight polyethylene

EP1308255A1
(en)

2001-10-30
2003-05-07
Dsm N.V.
Process for the manufacturing of a shaped part of ultra high molecular weight polyethylene and a fibre made with this process

CN100480025C
(en)

2002-01-29
2009-04-22
普乐士整形术公司
Sintering ultrahigh molecular weight polyethylene

BRPI0408095B1
(en)

2003-03-05
2017-09-26
Bhp Billiton Petroleum Pty Limited.

HOSE END CONNECTION

US7344672B2
(en)

2004-10-07
2008-03-18
Biomet Manufacturing Corp.
Solid state deformation processing of crosslinked high molecular weight polymeric materials

MY151732A
(en)

2006-05-08
2014-06-30
Bhp Billiton Petroleum Pty Ltd
Improvements relating to hose

GB0609079D0
(en)

2006-05-08
2006-06-21
Bhp Billiton Petroleum Pty Ltd
Improvements relating to hose

SG171661A1
(en)

2006-05-08
2011-06-29
Bhp Billiton Petroleum Pty Ltd
Improvements relating to hose

GB0612991D0
(en)

2006-06-29
2006-08-09
Bhp Billiton Petroleum Pty Ltd
Improvements relating to hose

GB0616053D0
(en)

2006-08-11
2006-09-20
Bhp Billiton Petroleum Pty Ltd
Improvements relating to hose

GB0616052D0
(en)

2006-08-11
2006-09-20
Bhp Billiton Petroleum Pty Ltd
Improvements relating to hose

CN101616782A
(en)

2006-10-30
2009-12-30
施乐辉骨科用品股份公司
Comprise crosslinked polyethylene or use the method for crosslinked polyethylene

US8708606B2
(en)

2007-09-14
2014-04-29
Bhp Billiton Petroleum Pty. Limited
Relating to pipe

US9441766B2
(en)

2009-06-02
2016-09-13
Bhp Billiton Petroleum Pty Ltd.
Reinforced hose

US10655042B2
(en)

2015-11-13
2020-05-19
Schlumberger Norge As
Wellbore strengthening additive and uses thereof

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Publication number
Priority date
Publication date
Assignee
Title

US3563870A
(en)

1969-01-23
1971-02-16

Dow Chemical Co

Melt strength and melt extensibility of irradiated linear polyethylene

EP0047171A2
(en)

1980-09-04
1982-03-10

Du Pont Canada Inc.

Process for irradiation of polyethylene

US4422993A
(en)

1979-06-27
1983-12-27

Stamicarbon B.V.

Process for the preparation of filaments of high tensile strength and modulus

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1971-11-01
1977-02-21

US3887319A
(en)

1972-12-08
1975-06-03
Polymer Corp
Apparatus for the extrusion of ultra high molecular weight polymeric resins

GB1568964A
(en)

1975-11-05
1980-06-11
Nat Res Dev
Oriented polymer materials

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(en)

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1981-11-25
Bowman J
Polymer processing

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(en)

1980-09-26
1982-09-07
Michigan Molecular Institute
Ultra-drawing crystalline polymers under high pressure

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(en)

1980-12-23
1982-07-16
Stamicarbon

LARGE TENSILE FILAMENTS AND MODULUS AND METHOD OF MANUFACTURE THEREOF.

AU549453B2
(en)

1981-04-30
1986-01-30
Allied Corporation
High tenacity, high modulus, cyrstalline thermoplastic fibres

NL8104728A
(en)

1981-10-17
1983-05-16
Stamicarbon

METHOD FOR MANUFACTURING POLYETHENE FILAMENTS WITH GREAT TENSILE STRENGTH

JPS58217322A
(en)

1982-06-12
1983-12-17
Somar Corp
Ultra-high molecular weight polyethylene produt

DE3363610D1
(en)

1982-12-28
1986-06-26
Mitsui Petrochemical Ind
Process for producing stretched articles of ultrahigh-molecular-weight polyethylene

JPS59216912A
(en)

1983-05-20
1984-12-07
Toyobo Co Ltd
Production of polyethylene fiber having high strength and modulus of elasticity

EP0139141B1
(en)

1983-08-15
1991-05-08
Toyo Boseki Kabushiki Kaisha
Production of stretched polymeric material having high strength and high modulus

JPS59216913A
(en)

1983-10-22
1984-12-07
Toyobo Co Ltd
Polyethylene fiber having high strength and modulus of elasticity

JPS59216914A
(en)

1983-10-22
1984-12-07
Toyobo Co Ltd
Production of polyethylene fiber having ultrahigh tenacity

JPS60101032A
(en)

1983-11-08
1985-06-05
Toyobo Co Ltd
Preparation of drawn substance of crystalline polymer of high strength and high elasticity modulus

GB8333032D0
(en)

1983-12-10
1984-01-18
Bp Chem Int Ltd
Orientated polyolefins

JPS60132744A
(en)

1983-12-21
1985-07-15
Nitto Electric Ind Co Ltd
Preparation of crosslinked ultra-high molecular weight polyethylene film

JPS60228122A
(en)

1984-04-27
1985-11-13
Toa Nenryo Kogyo Kk
Extremely thin polyethylene film and its manufacture

US4600631A
(en)

1984-05-01
1986-07-15
Massachusetts Institute Of Technology
Ultra tough plastic material

JPS60236716A
(en)

1984-05-10
1985-11-25
Mitsubishi Monsanto Chem Co
Manufacture of superhigh molecular weight polyethylene film or sheet

JPH0678379B2
(en)

1984-08-30
1994-10-05
三井石油化学工業株式会社

Ultra high molecular weight crystalline polyethylene modified product and method for producing the same

US4655769A
(en)

1984-10-24
1987-04-07
Zachariades Anagnostis E
Ultra-high-molecular-weight polyethylene products including vascular prosthesis devices and methods relating thereto and employing pseudo-gel states

DE4128570A1
(en)

1991-08-28
1993-03-04
Pluss Stauffer Ag

CARBONATE-CONTAINING MINERAL FUELS AND PIGMENTS

JPH0659172A
(en)

1992-08-05
1994-03-04
Ricoh Co Ltd
Objective lens, method for adjusting inclination of objective lens and device for manufacturing objective lens

1985

1985-08-21
NL
NL8502298A
patent/NL8502298A/en
not_active
Application Discontinuation

1986

1986-07-11
IN
IN534/MAS/86A
patent/IN167813B/en
unknown

1986-08-07
KR
KR1019860006507A
patent/KR900004839B1/en
not_active
IP Right Cessation

1986-08-18
EP
EP86201434A
patent/EP0215507B1/en
not_active
Expired

1986-08-18
DE
DE8686201434T
patent/DE3666787D1/en
not_active
Expired

1986-08-18
AT
AT86201434T
patent/ATE47814T1/en
not_active
IP Right Cessation

1986-08-19
BR
BR8603956A
patent/BR8603956A/en
unknown

1986-08-19
ES
ES8601170A
patent/ES2001236A6/en
not_active
Expired

1986-08-19
CA
CA000516231A
patent/CA1275637C/en
not_active
Expired – Lifetime

1986-08-19
ZA
ZA866253A
patent/ZA866253B/en
unknown

1986-08-19
JP
JP61195113A
patent/JPS6248527A/en
active
Pending

1986-08-19
AU
AU61587/86A
patent/AU585053B2/en
not_active
Ceased

1987

1987-10-09
US
US07/106,457
patent/US4888141A/en
not_active
Expired – Fee Related

Patent Citations (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3563870A
(en)

1969-01-23
1971-02-16
Dow Chemical Co
Melt strength and melt extensibility of irradiated linear polyethylene

US4422993A
(en)

1979-06-27
1983-12-27
Stamicarbon B.V.
Process for the preparation of filaments of high tensile strength and modulus

EP0047171A2
(en)

1980-09-04
1982-03-10
Du Pont Canada Inc.
Process for irradiation of polyethylene

Also Published As

Publication number
Publication date

JPS6248527A
(en)

1987-03-03

IN167813B
(en)

1990-12-22

CA1275637C
(en)

1990-10-30

ES2001236A6
(en)

1988-05-01

ATE47814T1
(en)

1989-11-15

KR870001927A
(en)

1987-03-28

DE3666787D1
(en)

1989-12-14

KR900004839B1
(en)

1990-07-08

BR8603956A
(en)

1987-03-24

NL8502298A
(en)

1987-03-16

AU6158786A
(en)

1987-02-26

EP0215507B1
(en)

1989-11-08

ZA866253B
(en)

1987-03-25

EP0215507A1
(en)

1987-03-25

US4888141A
(en)

1989-12-19

Información de contacto