US4614677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone release layers, laminates and methods
Assignee: Flexcon Co Inc
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Filing: 1984-04-04
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Granted: 1986-09-30
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Expires: 2004-04-04
Abstract
Abstract A silicone release laminate formed by a support with a silicone release layer. A separate pressure-sensitive silicone adhesive release layer may be on the same side of the support as the release layer, or on opposite sides of the support. The force required to separate the adhesive from the release layer is less than about 100 grams (3.3 oz.) per inch, and preferably less than 50 grams (1.7 oz.) per inch. The release layer is formed from one or more organopolysiloxanes having a viscosity below 1000 centipoises, and preferably below about 600 centipoises, with a high degree of cross-linking. The organopolysiloxanes may be produced directly by hydrolysis of organo-substituted halosiloxanes and depolymerization; or by hydration of higher molecular weight organopolysiloxanes and heat treatment to produce lower weight constituents.
Inventors
- 👤 John R. Pennace
- 👤 Sharon A. Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:35
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61F; A61F13/00; A61F13/02; A61L15/22; A61L15/26; C; C09; C09J; C09J7/00; C09J7/40; C09J7/401; C09J2483/00; C09J2483/005; Y; Y10; Y10T; Y10T428/00; Y10T428/14; Y10T428/1438; Y10T428/28; Y10T428/2839; Y10T428/2848; Y10T428/2852; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
An article comprising a backing, and a releasable organopolysiloxane on said backing, said organopolysiloxane having a solventless viscosity before curing in the range from about 60 centipoises to about 600 centipoises at 25° C., wherein an adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin and at least one alkylaryl polysiloxane gum, is positioned on said backing; and wherein said releasable organopolysiloxane has the following structure: ##STR4## wherein R' is an alkyl radical; R is partially or entirely hydrogen, partially vinyl, and/or partially hydroxyl, with the remainder alkyl; X is below 350.
Claim 2
Dependent Claim
95 words
An article comprising a backing, and a releasable organopolysiloxane on said backing, said organopolysiloxane having a solventless viscosity before curing in the range from about 60 centipoises to about 600 centipoises at 25° C., wherein an adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin and at least one alkylaryl polysiloxane gum, is positioned on said backing; and wherein said releasable organopolysiloxane has the following structure: ##STR4## wherein R' is an alkyl radical; R is partially or entirely hydrogen, partially vinyl, and/or partially hydroxyl, with the remainder alkyl; X is below 350.
Claim 3
Dependent Claim
17 words
An article as defined in claim 1 wherein the releasable material contains vinyl groups prior to curing.
Claim 4
Dependent Claim
17 words
An article as defined in claim 2 wherein the vinyl groups are a part of alkylvinylsiloxy groups.
Claim 5
Dependent Claim
17 words
An article as defined in claim 1 wherein the releasable material contains reactive hydrogen prior to curing.
Claim 6
Dependent Claim
17 words
An article as defined in claim 4 wherein the reactive hydrogens are a part of alkylhydrogensilanol groups.
Claim 7
Dependent Claim
18 words
An article as defined in claim 1 wherein the releasable material is dimethylpolysiloxane cured into a dense polymer.
Claim 8
Dependent Claim
26 words
An article as defined in claim 1 wherein said releasable organopolysiloxane, before curing, being formed from a plurality of prepolymers having a viscosity below 1000 centipoises.
Claim 9
Dependent Claim
30 words
The method of producing the article of claim 1 comprising the steps of (a) coating the releasable organopolysiloxane on said backing; and (b) curing said releasable polysiloxane on said backing.
Claim 10
Dependent Claim
53 words
The method of producing the article of claim 3 comprising the steps of (a) coating the releasable organopolysiloxane on said backing; (b) curing said releasable organopolysiloxane on said backing; (c) applying an organopolysiloxane pressure-sensitive adhesive layer directly to said backing or upon said releasable siloxane; and (d) curing said adhesive on said backing.
Claim 11
Dependent Claim
19 words
The method of claim 8 further including the step of converting residual surface reactive groups to more inert groups.
Claim 12
Dependent Claim
15 words
The method of claim 10 wherein the surface groups are treated with hydrogen-free, reactive silanes.
Claim 13
Dependent Claim
25 words
The method of claim 8 wherein a catalyst is used selected from the class consisting of (a) di-n-butyltindiesters; (b) rhodium complexes; and (c) platinum complexes.
Claim 14
Dependent Claim
32 words
The method of claim 8 wherein a cross-linker is used selected from the class consisting of (a) dicyclopentadiene (b) methyltriacetoxysilane (c) polysiloxanes with a plurality of vinyl substituents; (d) disilanol terminated dimethylpolysiloxanes.
Claim 15
Dependent Claim
105 words
An article comprising a backing and a releasable organopolysiloxane on said backing having an absorption ratio of hydrogen-bonded silicon greater than 0.4 and having a solvent less viscosity before curing in the range from about 60 centipoises to about 600 centipoises at 25° C.; wherein an adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin and at least one alkylaryl polysiloxane gum, is positioned on said backing; and wherein said releasable organopolysiloxane has the following structure: ##STR5## wherein R' is an alkyl radical; R is partially or entirely hydrogen, partially vinyl, and/or partially hydroxyl, with the remainder alkyl; X is below 350.
Claim 16
Dependent Claim
105 words
An article comprising a backing and a releasable organopolysiloxane on said backing having an absorption ratio of hydrogen-bonded silicon greater than 0.4 and having a solvent less viscosity before curing in the range from about 60 centipoises to about 600 centipoises at 25° C.; wherein an adhesive comprising the intercondensation product of a mixture containing an organopolysiloxane resin and at least one alkylaryl polysiloxane gum, is positioned on said backing; and wherein said releasable organopolysiloxane has the following structure: ##STR5## wherein R' is an alkyl radical; R is partially or entirely hydrogen, partially vinyl, and/or partially hydroxyl, with the remainder alkyl; X is below 350.
Claim 17
Dependent Claim
26 words
An article as defined in claim 1 wherein said releasable organopolysiloxane layer is cross-linked to absorb less than 200 percent of its cured weight in solvent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |