US4016328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone pressure-sensitive adhesives and tapes
Assignee: General Electric Co
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Filing: 1975-08-22
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Granted: 1977-04-05
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Expires: 1995-08-22
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 22:35
CPC Classifications
C; C09; C09J; C09J183/00; C09J183/02; C08; C08L; C08L83/00; C09J183/04; C09J7/00; C09J7/30; C09J7/38; C08L2666/00; C08L2666/28; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A pressure-sensitive tape comprising a coherent unitary backing and a pressure-sensitive adhesive applied to a surface of said backing, said adhesive comprising the siloxane product of heat intercondensation of a silicone resin, a silicone gum and a catalytic amount of a curing agent therefore, said curing agent comprising before curing from about 10 to about 90% by weight of 2, 4, - dichlorobenzoyl peroxide, from about 2 to about 30% by weight of a plasticizer therefore, said plasticizer being a high boiling ester of low volatility, and for the balance an extender therefore, 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 2
Dependent Claim
119 words
A pressure-sensitive tape comprising a coherent unitary backing and a pressure-sensitive adhesive applied to a surface of said backing, said adhesive comprising the siloxane product of heat intercondensation of a silicone resin, a silicone gum and a catalytic amount of a curing agent therefore, said curing agent comprising before curing from about 10 to about 90% by weight of 2, 4, - dichlorobenzoyl peroxide, from about 2 to about 30% by weight of a plasticizer therefore, said plasticizer being a high boiling ester of low volatility, and for the balance an extender therefore, 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 3
Dependent Claim
36 words
A pressure-sensitive tape as defined in claim 1 in which the extender for said curing agent comprises a methylphenyl siloxane fluid wherein the phenyl-silicon linkages comprise from about 10 to about 75% of the carbon-silicon linkages.
Claim 4
Dependent Claim
37 words
A pressure-sensitive tape as defined in claim 2 in which the extender for said curing agent comprises a methylphenyl 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 pressure-sensitive tape as defined in claim 1 in which the extender for said curing agent comprises a methyl phenylethylsiloxane fluid wherein the phenylethylsilicon linkages comprise from about 10 to about 75% of the carbon-silicon linkages.
Claim 6
Dependent Claim
43 words
A pressure-sensitive tape as defined in claim 1 in which the 2, 4 - dichlorobenzoyl peroxide comprises, before curing, from about 0.1 to about 2.5 parts by weight per 100 parts of the combined weights of said silicone resin and said silicone gum.
Claim 7
Dependent Claim
43 words
A pressure-sensitive tape as defined in claim 5 in which the 2, 4 - dichlorobenzoyl peroxide comprises, before curing, 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
21 words
A pressure-sensitive tape as defined in claim 1 in which the high boiling ester of low volatility is a dialkyl phthalate.
Claim 9
Dependent Claim
26 words
A pressure-sensitive tape as defined in claim 7 in which the dialkyl phthalate plasticizer is selected from the group consisting of dioctyl phthalate and dibutyl phthalate.
Claim 10
Dependent Claim
53 words
A pressure-sensitive tape as defined in claim 1 in which 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 11
Dependent Claim
37 words
A pressure-sensitive tape as defined in claim 1 in which 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 12
Dependent Claim
30 words
A pressure-sensitive tape as defined in claim 10 there being employed in said silicone resin from 1 to 2 moles of the alkyl silicate per mole of trialkyl hydrolyzable silane.
Claim 13
Dependent Claim
25 words
A pressure-sensitive tape as defined in claim 1 in which said silicone gum comprises a linear high viscosity organopolysiloxane fluid containing terminal silicon-bonded hydroxyl groups.
Claim 14
Dependent Claim
61 words
A pressure-sensitive tape as defined in claim 12, 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 15
Dependent Claim
36 words
A pressure-sensitive tape as defined in claim 1 in which said silicone resin in a copolymer of SiO 2 units and R 3 SiO 0 .5 units, where R is methyl, ethyl, propyl, vinyl or phenyl.
Claim 16
Dependent Claim
30 words
A pressure-sensitive tape as defined in claim 1 in which said silicone gum is a silanol end-stopped diorganopolysiloxane in which the organic radicals are methyl, ethyl, vinyl or phenyl groups.
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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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |