GB1289526A

GB1289526A – – Google Patents

GB1289526A – – Google Patents

Info

Publication number
GB1289526A

GB1289526A

GB1289526DA
GB1289526A
GB 1289526 A
GB1289526 A
GB 1289526A

GB 1289526D A
GB1289526D A
GB 1289526DA
GB 1289526 A
GB1289526 A
GB 1289526A
Authority
GB
United Kingdom
Prior art keywords
radical
initiator
polymer
carbanion
silane
Prior art date
1969-04-18
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.)

Expired

Application number

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.)
1969-04-18
Filing date
1969-04-18
Publication date
1972-09-20

1969-04-18
Application filed
filed
Critical

1972-09-20
Publication of GB1289526A
publication
Critical
patent/GB1289526A/en

Status
Expired
legal-status
Critical
Current

Links

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Global Dossier

Discuss

Classifications

C—CHEMISTRY; METALLURGY

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

C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule

C08G77/04—Polysiloxanes

C08G77/06—Preparatory processes

Abstract

1289526 Carbanion-polymerization of cyclic organosiloxanes DOW CORNING Ltd 15 April 1970 [18 April 1969] 19879/69 Headings C3P and C3T An organopolysiloxane is obtained by (1) polymerizing in the presence of a carbanion-producing initiator a cyclic organosiloxane [R 2 SiO] n , wherein each R is H or a methyl, phenyl, vinyl or CF 3 -CH 2 -CH 2 – radical and n is 3, 4 or 5, not more than 50% of the substituents R being H, and (2) reacting the product with a silane R1 2 R11SiX, wherein each R1 is a C 1-4 alkyl or alkenyl radical or a phenyl radical, R11 is an alkyl radical of at least 5 C atoms, and X is Cl, Br or I. Suitable initiators include the alkali metals and their hydrocarbon derivatives and complexes; a solvent, e.g. tetrahydrofuran, tetrahydropyran, dioxan, diethoxyethane dimethyl acetamide, dimethyl formamide or dimethyl sulphoxide, is preferably used; the amount of initiator is preferably such as to give a molecular weight of 400-40,000. The silane is added when the desired molecular weight is reached; it will react with one or both ends of the polymer according to the initiator, butyl lithium, for instance giving a monofunctional polymer, an alkali metal giving a difunctional polymer. In the example butyl lithium is used to polymerize hexamethylcyclotrisiloxane in tetrahydrofuran at 22‹ C.; after 2 hrs. dimethyldecylchlorosilane in benzene is added. The product, precipitated by addition of methanol is When 1% by weight of this is incorporated into polyethylene or polystyrene, reduced solid surface tension is observed.

GB1289526D
1969-04-18
1969-04-18

Expired

GB1289526A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

GB1987969

1969-04-18

Publications (1)

Publication Number
Publication Date

GB1289526A
true

GB1289526A
(en)

1972-09-20

Family
ID=10136706
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB1289526D
Expired

GB1289526A
(en)

1969-04-18
1969-04-18

Country Status (1)

Country
Link

GB
(1)

GB1289526A
(en)

Cited By (8)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

FR2398768A1
(en)

*

1977-07-27
1979-02-23
Raychem Ltd

SILICONE RESINS PRODUCTION PROCESS

US6020430A
(en)

*

1998-05-20
2000-02-01
Fmc Corporation
Functionalized diene and alkenylsubstituted aromatic silicone copolymers and processes for making the same

US6031060A
(en)

*

1997-05-22
2000-02-29
Fmc Corporation
Functionalized silicone polymers and processes for making the same

US6344521B1
(en)

1998-05-20
2002-02-05
Fmc Corporation
Protected functionalized diene and alkenyl substituted aromatic silicone triblock copolymers and processes for making the same

WO2006106361A1
(en)

*

2005-04-06
2006-10-12
Dow Corning Corporation
Organosiloxane compositions

US8487037B2
(en)

2009-03-26
2013-07-16
Dow Corning Corporation
Preparation of organosiloxane polymers

US8735493B2
(en)

2009-03-26
2014-05-27
Dow Corning Corporation
Preparation of organosiloxane polymers

CN101151324B
(en)

*

2005-04-06
2014-06-25
陶氏康宁公司
Organosiloxane compositions

1969

1969-04-18
GB
GB1289526D
patent/GB1289526A/en
not_active
Expired

Cited By (17)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

FR2398768A1
(en)

*

1977-07-27
1979-02-23
Raychem Ltd

SILICONE RESINS PRODUCTION PROCESS

US6031060A
(en)

*

1997-05-22
2000-02-29
Fmc Corporation
Functionalized silicone polymers and processes for making the same

US6271330B1
(en)

1997-05-22
2001-08-07
Fmc Corporation
Functionalized silicone polymers and processes for making the same

US6020430A
(en)

*

1998-05-20
2000-02-01
Fmc Corporation
Functionalized diene and alkenylsubstituted aromatic silicone copolymers and processes for making the same

US6344521B1
(en)

1998-05-20
2002-02-05
Fmc Corporation
Protected functionalized diene and alkenyl substituted aromatic silicone triblock copolymers and processes for making the same

US8067519B2
(en)

2005-04-06
2011-11-29
Dow Corning Corporation
Organosiloxane compositions

US7754800B2
(en)

2005-04-06
2010-07-13
Dow Corning Europe Sa
Organosiloxane compositions

US8022162B2
(en)

2005-04-06
2011-09-20
Dow Corning Corporation
Organosiloxane compositions

WO2006106361A1
(en)

*

2005-04-06
2006-10-12
Dow Corning Corporation
Organosiloxane compositions

US8076411B2
(en)

2005-04-06
2011-12-13
Dow Corning Corporation
Organosiloxane compositions

US8084535B2
(en)

2005-04-06
2011-12-27
Dow Corning Corporation
Organosiloxane compositions

US8088857B2
(en)

2005-04-06
2012-01-03
Dow Corning Corporation
Organosiloxane compositions

US8153724B2
(en)

2005-04-06
2012-04-10
Dow Corning Corporation
Organosiloxane compositions

US8344087B2
(en)

2005-04-06
2013-01-01
Dow Corning Corporation
Hydrosilylation cured organosiloxanes having diluent therein

CN101151324B
(en)

*

2005-04-06
2014-06-25
陶氏康宁公司
Organosiloxane compositions

US8487037B2
(en)

2009-03-26
2013-07-16
Dow Corning Corporation
Preparation of organosiloxane polymers

US8735493B2
(en)

2009-03-26
2014-05-27
Dow Corning Corporation
Preparation of organosiloxane polymers

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Legal Events

Date
Code
Title
Description

1973-01-31
PS
Patent sealed

1979-12-05
PCNP
Patent ceased through non-payment of renewal fee

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