Patent US2884150A successfully refreshed from Google Patents.
US4151344A
Expired / Lapsed
US
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Release substrate
Assignee: HP SMITH Inc A Corp OF
•
Filing: 1977-12-29
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Granted: 1979-04-24
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Expires: 1997-12-29
Abstract
Abstract A selected polymethyldihydroxysiloxane, a polymethylhydrosiloxane, a tetraalkyl titanate, and a low molecular weight, silicate-derived polymer are compounded to produce a release coating having significantly improved properties. A method for compositing an adhesive-coated material and a protective covering therefor, the covering having thereon a coating of the release composition of the invention as set forth.
Inventors
- 👤 Richard C. Doss
- 👤 Robert E. Reusser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:12
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/54; C08L83/02; C09; C09J; C09J7/00; C09J7/40; C09J7/401; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C09J2483/00; C09J2483/005; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
A composition suitable for application as a release coating comprising a high molecular weight polymethyldihydroxysiloxane, a low molecular weight polymethylhydrosiloxane, a low molecular weight silicate-derived polymer and a tetraalkyl titanate wherein the high molecular weight polymethyldihydroxysiloxane can be represented by the general formula HO[Si(CH 3 ) 2 O] n H wherein n represents the number of repeating units in the polymer chain and is generally in the range of from about 1000 to about 5000; the low molecular weight polymethylhydrosiloxane can have a linear, cyclic or branched configuration and can be either a homopolymer or a copolymer in which ##STR4## is from about 1 to about 10 percent by weight, based on the weight of the polymethyldihydroxysiloxane; the silicate-derived polymers have a molecular weight in the approximate range of from about 3000 to 10,000; and wherein a catalyst and an organic solvent are employed and wherein the ingredients are present in the approximate parts by weight: ______________________________________
Polymethyldihydroxysiloxane
3
Polymethylhydrosiloxane 0.03-0.3
Silicate-derived polymer .1-.5
Tetraalkyl titanate .05-2
Catalyst .01-.6
Solvent 20-200
______________________________________
Claim 2
Dependent Claim
172 words
A composition suitable for application as a release coating comprising a high molecular weight polymethyldihydroxysiloxane, a low molecular weight polymethylhydrosiloxane, a low molecular weight silicate-derived polymer and a tetraalkyl titanate wherein the high molecular weight polymethyldihydroxysiloxane can be represented by the general formula HO[Si(CH 3 ) 2 O] n H wherein n represents the number of repeating units in the polymer chain and is generally in the range of from about 1000 to about 5000; the low molecular weight polymethylhydrosiloxane can have a linear, cyclic or branched configuration and can be either a homopolymer or a copolymer in which ##STR4## is from about 1 to about 10 percent by weight, based on the weight of the polymethyldihydroxysiloxane; the silicate-derived polymers have a molecular weight in the approximate range of from about 3000 to 10,000; and wherein a catalyst and an organic solvent are employed and wherein the ingredients are present in the approximate parts by weight: ______________________________________
Polymethyldihydroxysiloxane
3
Polymethylhydrosiloxane 0.03-0.3
Silicate-derived polymer .1-.5
Tetraalkyl titanate .05-2
Catalyst .01-.6
Solvent 20-200
______________________________________
Claim 3
Dependent Claim
41 words
A composition according to claim 1 wherein a catalyst and solvent are employed and wherein the ingredients are present in the approximate parts by weight: ______________________________________
Polymethyldihydroxysiloxane
3
Polymethylhydrosiloxane .06-.15
Silicate-derived polymer .2-.3
Tetraalkyl titanate .3-.7
Catalysts .1-.5
Solvent 50-80
______________________________________
Claim 4
Dependent Claim
27 words
A composition according to claim 1 wherein the tetraalkyl titanate is selected from tetramethyl titanate, tetraethyl titanate, tetraisopropyl titanate, tetra-n-butyl titanate, tetraoctyl titanate, tetradecyl titanate, tetradodecyl titanate.
Claim 5
Independent Claim
179 words
A method for the preparation of a composition suitable as a release coating or substrate which comprises bringing together in a suitable organic solvent a polymethyldihydroxysiloxane, a polymethylhydrosiloxane, a silicate-derived polymer, a tetraalkyl titanate and a catalyst and agitating the mass thus obtained to homogenize the blend wherein the high molecular weight polymethyldihydroxysiloxane can be represented by the general formula HO[Si(CH 3 ) 2 O] n H wherein n represents the number of repeating units in the polymer chain and is generally in the range of from about 1000 to about 5000; the low molecular weight polymethylhydrosiloxane can have a linear, cyclic or branched configuration and can be either a homopolymer or a copolymer in which ##STR5## is from about 1 to about 10 percent by weight, based on the weight of the polymethyldihydroxysiloxane; the silicate-derived polymers have a molecular weight in the approximate range of from about 3000 to 10,000; and wherein the ingredients are present in the approximate parts by weight: ______________________________________
Polymethyldihydroxysiloxane
3
Polymethylhydrosiloxane 0.03-0.3
Silicate-derived polymer .1-.5
Tetraalkyl titanate .05-2
Catalyst .01-.6
Solvent 20-200
______________________________________
Claim 6
Independent Claim
179 words
A method for the preparation of a composition suitable as a release coating or substrate which comprises bringing together in a suitable organic solvent a polymethyldihydroxysiloxane, a polymethylhydrosiloxane, a silicate-derived polymer, a tetraalkyl titanate and a catalyst and agitating the mass thus obtained to homogenize the blend wherein the high molecular weight polymethyldihydroxysiloxane can be represented by the general formula HO[Si(CH 3 ) 2 O] n H wherein n represents the number of repeating units in the polymer chain and is generally in the range of from about 1000 to about 5000; the low molecular weight polymethylhydrosiloxane can have a linear, cyclic or branched configuration and can be either a homopolymer or a copolymer in which ##STR5## is from about 1 to about 10 percent by weight, based on the weight of the polymethyldihydroxysiloxane; the silicate-derived polymers have a molecular weight in the approximate range of from about 3000 to 10,000; and wherein the ingredients are present in the approximate parts by weight: ______________________________________
Polymethyldihydroxysiloxane
3
Polymethylhydrosiloxane 0.03-0.3
Silicate-derived polymer .1-.5
Tetraalkyl titanate .05-2
Catalyst .01-.6
Solvent 20-200
______________________________________
Claim 7
Dependent Claim
44 words
A method for preparing a well-retained, but readily removal protective coating for an adhesive coated substrate which comprises applying to a film to be applied to the adhesive to protect the same prior to application of said film, a composition according to claim 1.
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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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |