US4348431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating plastic films
Assignee: General Electric Co
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Filing: 1981-02-19
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Granted: 1982-09-07
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Expires: 2001-02-19
Abstract
Abstract Plastic films are (i) continuously coated with composition comprising a dispersion of colloidal silica in an aliphatic alcohol-water solution of the partial condensate of a silanol to which there has been added a small amount of a buffered latent silanol condensation catalyst and a minor proportion, sufficient to promote flow, of a β-hydroxy ketone compound and (ii) thereafter transported to a heated zone for rapid curing.
Inventors
- 👤 William J. O'Malley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:58
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J2483/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663; Y10T428/31786
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
163 words
A method for coating plastic films which comprises the steps of (i) applying to a moving web of said plastic film an aqueous composition comprising a dispersion of colloidal silica in an aliphatic alcohol-water-solution of the partial condensate of a silanol of the formula RSi(OH) 3 , wherein R is selected from the group consisting of alkyl having from 1 to 3 carbon atoms and aryl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids, said solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition including a small, catalytic amount of a buffered latent silanol condensation catalyst and a minor proportion, sufficient to promote flow, of a β-hydroxyketone compound; and (ii) transporting said film into a zone of elevated temperature sufficient to effect substantially complete cure of the silanol in less than about 120 seconds.
Claim 2
Independent Claim
163 words
A method for coating plastic films which comprises the steps of (i) applying to a moving web of said plastic film an aqueous composition comprising a dispersion of colloidal silica in an aliphatic alcohol-water-solution of the partial condensate of a silanol of the formula RSi(OH) 3 , wherein R is selected from the group consisting of alkyl having from 1 to 3 carbon atoms and aryl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids, said solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition including a small, catalytic amount of a buffered latent silanol condensation catalyst and a minor proportion, sufficient to promote flow, of a β-hydroxyketone compound; and (ii) transporting said film into a zone of elevated temperature sufficient to effect substantially complete cure of the silanol in less than about 120 seconds.
Claim 3
Dependent Claim
20 words
A method as defined in claim 1 wherein cure of the silanol is accomplished in less than about 30 seconds.
Claim 4
Dependent Claim
33 words
A method as defined in claim 1 wherein said catalyst consists essentially of an alkali metal or quaternary ammonium salt of a monocarboxylic aliphatic acid containing from 2 to 8 inclusive carbon atoms.
Claim 5
Dependent Claim
45 words
A method as defined in claim 3 wherein said alkali metal is potassium or sodium and said quaternary ammonium salt includes the cation (R 1 ) 4 N+ wherein R 1 is C 1 -C 6 or mono phenyl substituted C 1 -C 6 alky.
Claim 6
Dependent Claim
19 words
A method as defined in claim 3 wherein said catalyst is potassium acetate, tetra(methyl)ammonium acetate or benzyl trimethylammonium acetate.
Claim 7
Dependent Claim
51 words
A method as defined in claim 1 wherein said hydroxyketone compound has the structural formula ##STR5## wherein R 1 is a monovalent hydrocarbon radical of from 1 to 18 carbon atoms, R 2 and R 3 are, independently, a monovalent hydrocarbon radical of from 1 to 18 carbon atoms or hydrogen.
Claim 8
Dependent Claim
14 words
A method as defined in claim 1 wherein said hydroxyketone compound is diacetone alcohol.
Claim 9
Dependent Claim
21 words
A method as defined in claim 1 wherein said aqueous composition also includes a minor proportion of a polysiloxane polyether copolymer.
Claim 10
Dependent Claim
18 words
A method as defined in claim 1 wherein the aliphatic alcohol is a mixture of methanol and isobutanol.
Claim 11
Dependent Claim
18 words
A method as defined in claim 1 wherein said partial condensate is of CH 3 Si(OH) 3 .
Claim 12
Dependent Claim
31 words
A method as defined in claim 1 wherein said buffered latent silanol condensation catalyst comprises from about 0.05 to about 5.0 weight percent based on the solids content of said composition.
Claim 13
Dependent Claim
29 words
A method as defined in claim 1 wherein in said hydroxyketone compound comprises from about 5 to about 10 weight percent based on the solids content of said composition.
Claim 14
Dependent Claim
36 words
A method as defined in claim 1 wherein in said aqueous composition contains from about 18 to about 25 weight percent solids comprising 25-45 weight percent colloidal silica and 55-75 weight percent of the partial condensate.
Claim 15
Independent Claim
186 words
A method for coating plastic films which comprises the steps of (i) applying to a moving web of said plastic film an aqueous composition comprising a dispersion of colloidal silica in an aliphatic alcohol-water-solution of the partial condensate of a silanol of the formula RSi(OH) 3 , wherein R is selected from the group consisting of alkyl having from 1 to 3 carbon atoms and aryl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids, said solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition including a small, catalytic amount of a buffered latent silanol condensation catalyst consisting essentially of an alkali metal or quaternary ammonium salt of a monocarboxylic aliphatic acid containing from 2 to 8 inclusive carbon atoms, and a minor proportion, sufficient to promote flow, of a β-hydroxyketone compound; and (ii) transporting said film into a zone of elevated temperature sufficient to effect substantially complete cure of the silanol in less than about 120 seconds.
Claim 16
Independent Claim
186 words
A method for coating plastic films which comprises the steps of (i) applying to a moving web of said plastic film an aqueous composition comprising a dispersion of colloidal silica in an aliphatic alcohol-water-solution of the partial condensate of a silanol of the formula RSi(OH) 3 , wherein R is selected from the group consisting of alkyl having from 1 to 3 carbon atoms and aryl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids, said solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition including a small, catalytic amount of a buffered latent silanol condensation catalyst consisting essentially of an alkali metal or quaternary ammonium salt of a monocarboxylic aliphatic acid containing from 2 to 8 inclusive carbon atoms, and a minor proportion, sufficient to promote flow, of a β-hydroxyketone compound; and (ii) transporting said film into a zone of elevated temperature sufficient to effect substantially complete cure of the silanol in less than about 120 seconds.
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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |