Patent EP0506372B1 successfully refreshed from Google Patents.
EP0506372B1
Expired / Lapsed
EP
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Solventless or high solids-containing silicone pressure sensitive adhesive compositions
Assignee: General Electric Co
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Filing: 1992-03-25
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Granted: 1995-12-06
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Expires: 2012-03-25
Abstract
No abstract record available.
Inventors
- 👤 Jeffrey Hayward Wengrovius
- 👤 Virginia Mary Van Valkenburgh
- 👤 Timothy Brydon Burnell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:32
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/04; C08; C08L; C08L83/00; C08L83/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
379 words
An organopolysiloxane composition curable to produce a pressure sensitive adhesive comprising by weight: (A) from 50 to 75 parts by weight of a toluene soluble, resinous copolymer comprising R₃SiO 1/2 units and SiO 4/2 units wherein R is a monovalent hydrocarbon radical having from 1 to 6 carbon atoms, the resinous copolymer comprising from 0.2% to 5.0% by weight, based on the total weight of the copolymer, of hydroxyl radicals, at least 95% of all R groups being an alkyl group, the total number of R radicals that are alkenyl radicals being 0-0.5% of all R radicals, the molar ratio of R₃SiO 1/2 units to SiO 4/2 units being from 0.6 to 0.9 inclusive; (B) an alkenyl-terminated polydiorganosiloxane having the general formula (I) R²R¹₂SiO(R¹₂SiO) m (R²R¹SiO) n SiR¹₂R² wherein each R¹ is independently an alkyl group having from 1 to 10 carbon atoms or an aryl group, R² is an alkenyl group having from 2 to 10 carbon atoms, "m" and "n" are numbers such that the sum of "m"+"n" is equal to a number in the range of from 1 to 300; (C) an organohydrogenpolysiloxane compatible with the mixture of (A) and (B) and having the general formula (II) R³₂HSiO(R³HSiO) a (R³₂SiO) b SiHR³₂ wherein each R³ is independently an alkyl group having from 1 to 10 carbon atoms or an aryl group, "a" and "b" each are numbers such that the sum of "a"+"b" is a number in the range of from 1 to 300, there being at least two silicon-bonded hydrogen atoms per molecule of (C), no silicon atom bearing more than one silicon bonded hydrogen atom; the total of (B) and (C) being from 25 to 50 parts by weight; the total of (A), (B), and (C) being 100 parts by weight; the molar ratio of silicon-bonded hydrogen groups in (C) to silicon-bonded alkenyl groups in (B) being in the range of from 0.8:1 to 1.5:1; with the proviso that the total crosslink density of (B) and (C) is from 0.3 to 5.0%, and with the further proviso that the combined viscosities of (B) and (C) are from 10 to 500 mPa.s (centipoises) at 25°C; (D) a catalytic amount of a hydrosilation catalyst; and (E) from 0 to 10% by weight of an organic solvent.
Claim 2
Dependent Claim
39 words
A composition according to claim 1 wherein the combined crosslink density of (B) and (C) is from 0.3 to 2.0% and the molar ratio of silicon-bonded hydrogen groups in (C) to silicon-bonded alkenyl groups in (B) is about 1:1.
Claim 3
Dependent Claim
15 words
A composition according to claim 1 wherein the hydrosilation catalyst is a platinum-containing hydrosilation catalyst.
Claim 4
Dependent Claim
35 words
A composition according to claim 1 wherein the platinum-containing hydrosilation catalyst is present in an amount of at least 1.0 part by weight per 1 million parts of the total of (A), (B), and (C).
Claim 5
Dependent Claim
14 words
A composition according to claim 1 further comprising an inhibitor for the hydrosilation catalyst.
Claim 6
Dependent Claim
14 words
A composition according to claim 1 wherein R, R¹, and R³ are each methyl.
Claim 7
Dependent Claim
12 words
A composition according to claim 1 wherein R² is a vinyl group.
Claim 8
Dependent Claim
22 words
A pressure sensitive adhesive tape comprising a flexible support carrying on at least one surface thereof the curable composition of claim 1.
Claim 9
Dependent Claim
31 words
A pressure sensitive adhesive tape according to claim 8 wherein the flexible support is an impregnated glass cloth, a polyester polymer, a polyimide polymer, or a chemically treated fluorocarbon polymer support.
Claim 10
Dependent Claim
371 words
A solventless organopolysiloxane composition curable to produce a pressure sensitive adhesive comprising by weight: (A) from 50 to 75 parts by weight of a toluene soluble, resinous copolymer comprising R₃SiO 1/2 units and SiO 4/2 units wherein R is a monovalent hydrocarbon radical having from 1 to 6 carbon atoms, the resinous copolymer comprising from 0.2% to 5.0% by weight, based on the total weight of the copolymer, of hydroxyl radicals, at least 95% of all R groups being an alkyl group, the total number of R radicals that are alkenyl radicals being 0-0.5% of all R radicals, the molar ratio of R₃SiO 1/2 units to SiO 4/2 units being from 0.6 to 0.9 inclusive; (B) an alkenyl-terminated polydiorganosiloxane having the general formula (I) R²R¹₂SiO(R¹₂SiO) m (R²R¹SiO) n SiR¹₂R² wherein each R¹ is independently an alkyl group having from 1 to 10 carbon atoms or an aryl group, R² is an alkenyl group having from 2 to 10 carbon atoms, "m" and "n" are numbers such that the sum of "m"+"n" is equal to a number in the range of from 1 to 300; (C) an organohydrogenpolysiloxane compatible with the mixture of (A) and (B) and having the general formula (II) R³₂HSiO(R³HSiO) a (R³₂SiO) b SiHR³₂ wherein each R³ is independently an alkyl group having from 1 to 10 carbon atoms or an aryl group, "a" and "b" each are numbers such that the sum of "a"+"b" is a number in the range of from 1 to 300, there being at least two silicon bonded hydrogen atoms per molecule of (C), no silicon atom bearing more than one silicon bonded hydrogen atom; the total of (B) and (C) being from 25 to 50 parts by weight; the total of (A), (B), and (C) being 100 parts by weight; the molar ratio of silicon-bonded hydrogen groups in (C) to silicon-bonded alkenyl groups in (B) being in the range of from about 0.8:1 to 1.5:1; with the proviso that the total crosslink density of (B) and (C) is from 0.3 to 5.0%, and with the further proviso that the combined viscosities of (B) and (C) are from 10 to 500 mPa.s (centipoises) at 25°C; and (D) a catalytic amount of a hydrosilation catalyst.
References Cited (Backward Citations)
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