EP0459292A2
Expired / Lapsed
EP
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Pressure sensitive adhesives
Assignee: General Electric Co
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Filing: 1991-05-23
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Granted: —
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Expires: 2011-05-23
Abstract
Abstract A composition suitable for forming a pressure sensitive adhesive is provided comprising a homogeneous mixture of two intermediate pressure sensitive adhesive compositions. The pressure sensitive adhesives formed by curing this composition have improved peel strength and adhesion properties.
Inventors
- 👤 Frank John Traver
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:20
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/04; C08; C08L; C08L83/00; C08L2666/00; C08L2666/28; C08L2666/52
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
394 words
A composition suitable for use as a pressure sensitive adhesive, comprising a homogeneous mixture of: I. about 50 to about 95 parts by weight of a first pressure sensitive adhesive composition comprising by weight: (A) about 49 to about 57% of a solid, benzene soluble resin copolymer consisting essentially of R₃SiO 1/2 units and SiO 4/2 units where each R individually is a monovalent hydrocarbon radical containing no more than six carbon atoms, there being from 0.6 to 0.9 inclusive R₃SiO 1/2 units for every SiO 4/2 units, at least 95 percent of all R radicals in I(A) being methyl and the total number of R radicals that have olefinic unsaturation being 0-0.5 percent of all R radicals in I(A), and (B) about 43 to about 51% of a hydroxyl end-blocked diorganopolysiloxane having the formula HO - (R 1 2 SiO) x - H wherein each R¹ individually is a radical selected from the group consisting of methyl, ethyl, vinyl, and phenyl, at least 95 percent of all R¹ radicals being methyl, the viscosity of the polydiorganosiloxane I(B) having a value of from about 100,000 to about 500,000,000 centipoises at 25 o C, the total of I(A) and I(B) being 100 parts by weight; and II. about 5 to about 50 parts by weight of a second pressure sensitive adhesive composition comprising by weight: (A) about 64 to about 74% of a solid, benzene soluble resin copolymer consisting essentially of R₃SiO 1/2 units and SiO 4/2 units where each R individually is a monovalent hydrocarbon radical containing no more than six carbon atoms, there being from 0.6 to 0.9 inclusive R₃SiO 1/2 units for every SiO 4/2 units, at least 95 percent of all R radicals in II(A) being methyl and the total number of R radicals that have olefinic unsaturation being 0-0.5 percent of all R radicals in II(A), and (B) about 26 to about 36% of a hydroxyl end-blocked diorganopolysiloxane having the formula HO - (R 1 2 SiO) x - H wherein each R¹ individually is a radical selected from the group consisting of methyl, ethyl, vinyl, and phenyl, at least 95 percent of all R¹ radicals being methyl, the viscosity of the polydiorganosiloxane II(B) having a value of from about 100,000 to about 500,000,000 centipoises at 25 o C, the total of II(A) and II(B) being 100 parts by weight.
Claim 2
Dependent Claim
27 words
A composition according to claim 1 wherein component I comprises about 51 to about 55% of component I(A) and about 45 to about 49% of component I(B).
Claim 3
Dependent Claim
21 words
A composition according to claim 2 wherein component I comprises about 53% of component I(A) and about 47% of component I(B).
Claim 4
Dependent Claim
27 words
A composition according to claim 1 wherein component II comprises about 67 to about 71% of component II(A) and about 29 to about 33% of component II(B).
Claim 5
Dependent Claim
21 words
A composition according to claim 4 wherein component II comprises about 69% of component II(A) and about 31% of component II(B).
Claim 6
Dependent Claim
26 words
A composition according to Claim 1 wherein the amount of component (I) is within the range of from about 60 to about 90 parts by weight.
Claim 7
Dependent Claim
26 words
A composition according to Claim 6 wherein the amount of component (I) is within the range of from about 70 to about 80 parts by weight.
Claim 8
Dependent Claim
26 words
A composition according to Claim 1 wherein the amount of component (II) is within the range of from about 10 to about 40 parts by weight.
Claim 9
Dependent Claim
26 words
A composition according to Claim 8 wherein the amount of component (II) is within the range of from about 20 to about 30 parts by weight.
Claim 10
Dependent Claim
19 words
A composition according to Claim 1 wherein all of the organic radicals in components (I) and (II) are methyl.
Claim 11
Dependent Claim
13 words
A composition according to Claim 1 wherein component (II) is a silanol-stopped polydimethylsiloxane.
Claim 12
Dependent Claim
33 words
A composition according to claim 1 further comprising about 10 to about 100 parts by weight of a rare earth metal salt of a fatty acid having 6 to about 18 carbon atoms.
Claim 13
Dependent Claim
16 words
The composition of claim 12 wherein the rare earth metal salt is rare earth metal octoate.
Claim 14
Dependent Claim
14 words
The composition of claim 13 wherein the rare earth metal salt is cerium octoate.
Claim 15
Dependent Claim
28 words
A composition according to Claim 12 wherein the amount of the rare earth metal salt is within the range of from about 15 to about 60% by weight.
Claim 16
Dependent Claim
28 words
A composition according to Claim 15 wherein the amount of the rare earth metal salt is within the range of from about 20 to about 30% by weight.
Claim 17
Dependent Claim
236 words
A composition suitable for use as a pressure sensitive adhesive, comprising a homogeneous mixture of: I. about 50 to about 95 parts by weight of a first pressure sensitive adhesive composition comprising by weight: (A) about 49 to about 57% of a solid, benzene soluble resin copolymer consisting essentially of CH₃SiO 1/2 units and SiO 4/2 units, there being from 0.6 to 0.9 inclusive CH₃SiO 1/2 units for every SiO 4/2 units, and (B) about 43 to about 51% of a hydroxyl end-blocked dimethylpolysiloxane having the formula HO - [(CH₃)₂SiO)] x - H wherein the viscosity of the polydimethylsiloxane has a value of from about 100,000 to about 500,000,000 centipoises at 25 o C, the total of I(A) and I(B) being 100 parts by weight; and II. about 5 to about 50 parts by weight of a second pressure sensitive adhesive composition comprising by weight: (A) about 64 to about 74% of a solid, benzene soluble resin copolymer consisting essentially of CH₃SiO 1/2 units and SiO 4/2 units, there being from 0.6 to 0.9 inclusive CH₃SiO 1/2 units for every SiO 4/2 units, and (B) about 26 to about 36% of a hydroxyl end-blocked dimethylpolysiloxane having the formula HO - [(CH₃SiO)] x - H wherein the viscosity of the polydimethylsiloxane has a value of from about 100,000 to about 500,000,000 centipoises at 25 o C, the total of II(A) and II(B) being 100 parts by weight.
Claim 18
Dependent Claim
12 words
A pressure sensitive adhesive prepared by curing the composition of claim 1.
Claim 19
Dependent Claim
12 words
A pressure sensitive adhesive prepared by curing the composition of claim 17.
Claim 20
Dependent Claim
23 words
An article of manufacture comprising a solid support having deposited on at least one surface thereof the pressure sensitive adhesive of claim 18.
Claim 21
Dependent Claim
60 words
An article according to claim 20 further comprising a primer layer, wherein the primer layer is situated on the surface of the substrate and the pressure sensitive adhesive of claim 17 is situated on the surface of the primer layer, the primer layer comprising a toluene solution of a curable dimethyl polysiloxane having a viscosity of 10,000-18,000 centipoise at 25°C.
Claim 22
Dependent Claim
23 words
An article of manufacture comprising a solid support having deposited on at least one surface thereof the pressure sensitive adhesive of claim 19.
Claim 23
Dependent Claim
60 words
An article according to claim 22 further comprising a primer layer, wherein the primer layer is situated on the surface of the substrate and the pressure sensitive adhesive of claim 19 is situated on the surface of the primer layer, the primer layer comprising a toluene solution of a curable dimethyl polysiloxane having a viscosity of 10,000-18,000 centipoise at 25°C.
Claim 24
Dependent Claim
24 words
A pressure sensitive adhesive tape comprising a flexible material having deposited on at least one surface thereof the pressure sensitive adhesive of claim 18.
Claim 25
Dependent Claim
64 words
A pressure sensitive adhesive tape according to claim 24 further comprising a primer layer, wherein the primer layer is situated on the surface of the flexible material and the pressure sensitive adhesive of claim 18 is situated on the surface of the primer layer, the primer layer comprising a toluene solution of a curable dimethyl polysiloxane having a viscosity of 10,000-18,000 centipoise at 25°C.
Claim 26
Dependent Claim
24 words
A pressure sensitive adhesive tape comprising a flexible material having deposited on at least one surface thereof the pressure sensitive adhesive of claim 19.
Claim 27
Dependent Claim
64 words
A pressure sensitive adhesive tape according to claim 26 further comprising a primer layer, wherein the primer layer is situated on the surface of the flexible material and the pressure sensitive adhesive of claim 19 is situated on the surface of the primer layer, the primer layer comprising a toluene solution of a curable dimethyl polysiloxane having a viscosity of 10,000-18,000 centipoise at 25°C.
References Cited (Backward Citations)
No citation records indexed.
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