US3969299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sizing of glass fibers using aqueous dispersions of film-forming copolymer of 90 percent by weight vinyl acetate with quaternary ammonium salt derivative of acrylic acid comonomer
Assignee: Fibreglass Ltd
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Filing: 1972-07-13
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Granted: 1976-07-13
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Expires: 1992-07-13
Abstract
Abstract This invention is concerned with coating Glass Fibers with size and is also concerned with the provision of an improved size composition for use in carrying out the coating step. We provide an aqueous size composition including a polymer dispersion of cationic character, at least 90% of the polymer being formed from units derived from vinyl acetate. The cationic character of the polymer dispersion is formed during preparation of the polymer dispersion by emulsion polymerization.
Inventors
- 👤 Robert Burns
- 👤 Alan Edward Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
An aqueous size composition for coating glass fibres comprising water, and a dispersion in said water of a film forming agent consisting essentially of about 5 to 15 percent by weight of a copolymer of at least 90 percent by weight vinyl acetate units wherein the comonomer units of said copolymer are cationic units and are a quaternary ammonium salt derivative of acrylic acid, and about 0.05 to 1 percent by weight of a silane lubricant.
Claim 2
Dependent Claim
76 words
An aqueous size composition for coating glass fibres comprising water, and a dispersion in said water of a film forming agent consisting essentially of about 5 to 15 percent by weight of a copolymer of at least 90 percent by weight vinyl acetate units wherein the comonomer units of said copolymer are cationic units and are a quaternary ammonium salt derivative of acrylic acid, and about 0.05 to 1 percent by weight of a silane lubricant.
Claim 3
Dependent Claim
30 words
An aqueous size composition for coatig glass fibres according to claim 1 wherein said copolymer contains said comonomer units in a concentration of about 1 to 3 percent by weight.
Claim 4
Dependent Claim
21 words
An aqueous size composition for coating glass fibres according to claim 1 wherein said cationic comonomer units are derived from 2-dimethylaminoethylmethacrylate.
References Cited (Backward Citations)
US2994619A
Cited
US3245938A
Cited
US3174874A
Cited
FR1356819A
Cited
NL6513671A
Cited
US3637565A
Cited
US3533768A
Cited
US3694393A
Cited
US3556754A
Cited
US3652326A
Cited
US3795648A
Cited
US3817898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |