Patent US3929704A successfully refreshed from Google Patents.
US3929704A
Expired / Lapsed
US
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Silicone pressure sensitive adhesives and tapes
Assignee: General Electric Co
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Filing: 1973-06-07
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Granted: 1975-12-30
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Expires: 1993-06-07
Abstract
Abstract A pressure-sensitive adhesive composition comprising a silicone resin, a silicone gum and a curing agent therefor, the curing agent comprising 2,4-dichlorobenzoyl peroxide in admixture with a plasticizer and an extender therefor, the extender comprising an alkylarylsiloxane or an alkylaralkylsiloxane fluid. Tapes made by coating a coherent unitary backing with the cured composition exhibit superior peel strengths.
Inventors
- 👤 Albert Emerson Horning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:03
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/02; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08K5/04; C08K5/14; C08L; C08L83/00; C08L83/02; C08L83/04; C09J183/04; C09J7/00; C09J7/30; C09J7/38; C08L2666/00; C08L2666/28; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
90 words
A PRESSURE-SENSITIVE ADHESIVE COMPOSITION COMPRISING A SILICONE RESIN, A SILICONE GUM AND A CATALYST AMOUNT OF A CURING AGENT THEREOF, SAID CURING AGENT COMPRISING FROM ABOUT 10 TO ABOUT 90% BY WEIGHT OF 2,4-DICHLOROBENZOYL PEROXIDE, FROM ABOUT 2 TO ABOUT 30% BY WEIGHT OF A PLASTICIZER THEREOF, SAID PLASTICIZER BEING A HIGH BOILING ESTER OF LOW VOLATILITY, AND FOR THE BALANCE AN EXTENDER THEREFOR, SAID ESTENDER COMPRISING AN ALKYLARYL OR AN ALKYLARALYL SILOXANE FLUID CONTAINING AT LEAST ABOUT 3% OF ARYL-SILICON OR ARALKYL-SILICON BONDS OUT OF THE TOTAL CARBON-SILICON LINKAGES.
Claim 2
Dependent Claim
90 words
A PRESSURE-SENSITIVE ADHESIVE COMPOSITION COMPRISING A SILICONE RESIN, A SILICONE GUM AND A CATALYST AMOUNT OF A CURING AGENT THEREOF, SAID CURING AGENT COMPRISING FROM ABOUT 10 TO ABOUT 90% BY WEIGHT OF 2,4-DICHLOROBENZOYL PEROXIDE, FROM ABOUT 2 TO ABOUT 30% BY WEIGHT OF A PLASTICIZER THEREOF, SAID PLASTICIZER BEING A HIGH BOILING ESTER OF LOW VOLATILITY, AND FOR THE BALANCE AN EXTENDER THEREFOR, SAID ESTENDER COMPRISING AN ALKYLARYL OR AN ALKYLARALYL SILOXANE FLUID CONTAINING AT LEAST ABOUT 3% OF ARYL-SILICON OR ARALKYL-SILICON BONDS OUT OF THE TOTAL CARBON-SILICON LINKAGES.
Claim 3
Dependent Claim
36 words
A composition as defined in claim 1 in which the extender for said curing agent comprises a methyl phenyl siloxane fluid wherein the phenyl-silicon linkages comprise from about 10 to about 75% of the carbon-silicon linkages.
Claim 4
Dependent Claim
36 words
A composition as defined in claim 2 in which the extender for said curing agent comprises a methyl phenyl siloxane fluid wherein the phenyl-silicon linkages comprise from about 15 to about 50% of the carbon-silicon linkages.
Claim 5
Dependent Claim
36 words
A composition as defined in claim 2 in which the extender for said curing agent comprises a methyl phenylethyl siloxane fluid wherein the phenylethyl-silicon linkages comprise from about 10 to about 75% of the carbon-silicon linkages.
Claim 6
Dependent Claim
36 words
A composition as defined in claim 1 wherein the 2,4-dichlorobenzoyl peroxide comprises from about 0.1 to about 5 parts by weight per 100 parts of the combined weights of said silicone resin and said silicone gum.
Claim 7
Dependent Claim
36 words
A composition as defined in claim 5 wherein the 2,4-dichlorobenzoyl peroxide comprises from about 0.25 to about 2.0 parts by weight per 100 parts of the combined weights of said silicone resin and said silicone gum.
Claim 8
Dependent Claim
42 words
A composition as defined in claim 1 wherein said curing agent comprises 2,4-dichlorobenzoyl peroxide in admixture with said plasticizer and said extender, the relative amounts of said plasticizer and said extender being selected to provide a paste-like consistency to said curing agent.
Claim 9
Dependent Claim
21 words
A composition as defined in claim 1 wherein the plasticizer for said curing agent is a liquid ester of low volatility.
Claim 10
Dependent Claim
13 words
A composition as defined in claim 8 wherein said ester is dibutyl phthalate.
Claim 11
Dependent Claim
51 words
A composition as defined in claim 1 wherein said silicone resin and said silicone gum are an intercondensation product of a mixture of 1 part of a silicone resin having a plurality of silicon-bonded hydroxyl groups and from 0.5 to 2 parts of a silicone gum containing terminal-silicon bonded hydroxyl groups.
Claim 12
Dependent Claim
35 words
A composition as defined in claim 1 wherein said silicone resin comprises (1) a cohydrolysis product of a trialkyl hydrolyzable silane and an alkyl silicate, said cohydrolysis product containing a plurality of silicon-bonded hydroxyl groups.
Claim 13
Dependent Claim
29 words
A composition as defined in claim 11 there being employed in said silicone resin from 1 to 2 moles of the alkyl silicate per mole of trialkyl hydrolyzable silane.
Claim 14
Dependent Claim
23 words
A composition as defined in claim 1 wherein said silicone gum comprises a linear high viscosity organopolysiloxane fluid containing terminal silicon-bonded hydroxyl groups.
Claim 15
Dependent Claim
60 words
A composition as defined in claim 13, the organic groups in said silicone gum being attached to silicon by carbon-silicon linkages and being selected from the class consisting of monovalent hydrocarbon radicals and halogenated aryl radicals, there being present an average of about two organic groups per silicon atom in the organopolysiloxane gum, said gum being aboVe 200,000 centipoises viscosity.
Claim 16
Dependent Claim
29 words
A composition as defined in claim 1 wherein said silicone resin is a copolymer of SiO2 units and R3SiO0.5 units, where R is methyl, ethyl, propyl, vinyl or phenyl.
Claim 17
Dependent Claim
28 words
A composition as defined in claim 1 wherein said silicone gum is a silanol end-stopped diorganopolysiloxane in which the organic radicals are methyl, ethyl, vinyl or phenyl groups.
Claim 18
Dependent Claim
20 words
A composition as defined in claim 1 wherein said composition also includes a solvent as a carrier for the adhesive.
Claim 19
Dependent Claim
18 words
A composition as defined in claim 17 wherein said solvent is an aromatic, naphthene or paraffin hydrocarbon solvent.
Claim 20
Dependent Claim
93 words
A pressure-sensitive adhesive composition comprising a silicone resin, a silicone gum and a catalytic amount of a curing agent therefor, said curing agent comprising from about 10 to about 90% by weight of 2,4-dichlorobenzoyl peroxide, from about 2 to about 30% by weight of a dialkyl phthalate plasticizer therefor, said dialkyl phthalate being a high boiling ester of low volatility, and for the balance an extender therefor, said extender comprising an alkylaryl or an alkylaralkyl siloxane fluid containing at least about 3% of aryl-silicon or aralkyl-silicon bonds out of the total carbon-silicon linkages.
Claim 21
Dependent Claim
93 words
A pressure-sensitive adhesive composition comprising a silicone resin, a silicone gum and a catalytic amount of a curing agent therefor, said curing agent comprising from about 10 to about 90% by weight of 2,4-dichlorobenzoyl peroxide, from about 2 to about 30% by weight of a dialkyl phthalate plasticizer therefor, said dialkyl phthalate being a high boiling ester of low volatility, and for the balance an extender therefor, said extender comprising an alkylaryl or an alkylaralkyl siloxane fluid containing at least about 3% of aryl-silicon or aralkyl-silicon bonds out of the total carbon-silicon linkages.
Claim 22
Dependent Claim
24 words
A composition as defined in claim 19 wherein said dialkyl phthalate plasticizer is selected from the group consisting of dioctyl phthalate and dibutyl phthalate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |