US3933711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming size of aqueous polyvinylacetate
Assignee: PPG Industries Inc
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Filing: 1974-07-23
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Granted: 1976-01-20
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Expires: 1994-07-23
Abstract
Abstract A glass fiber forming size utilized to produce glass fiber strands is described in which the forming size is an aqueous mixture of polyvinyl acetate, fatty acid lubricant, methacrylato chromic chloride and gamma (ethylene diamine) propyl trimethoxy silane, the mixture being adjusted to pH between 6.1 and 6.5. The size composition is applied to glass fibers during forming. The strands produced utilizing this forming size find particular utility when formed into roving and produce a particularly effective gun roving product.
Inventors
- 👤 Donald L. Motsinger
- 👤 Charles E. Nalley
- 👤 Joe B. Lovelace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
C; C08; C08L; C08L31/00; C08L31/02; C08L31/04; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/28; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
An aqueous sizing composition for glass fiber strand whose ingredients other than water consists essentially of: 70 to 90 percent by weight based on total weight of the size solution solids of a polyvinyl acetate film former; 4 to 7 percent by weight based on solids fatty acid amide lubricant; 3 to 6 percent by weight solids gamma-ethylene diamine propyl trialkoxy silane; and 2 to 6 percent by weight solids methacrylic acid chromic halide coupling agent; said sizing composition having been adjusted to a pH of about 6.2 to 6.4, and said composition having 7.0 to 7.5 percent by weight solids.
Claim 2
Dependent Claim
101 words
An aqueous sizing composition for glass fiber strand whose ingredients other than water consists essentially of: 70 to 90 percent by weight based on total weight of the size solution solids of a polyvinyl acetate film former; 4 to 7 percent by weight based on solids fatty acid amide lubricant; 3 to 6 percent by weight solids gamma-ethylene diamine propyl trialkoxy silane; and 2 to 6 percent by weight solids methacrylic acid chromic halide coupling agent; said sizing composition having been adjusted to a pH of about 6.2 to 6.4, and said composition having 7.0 to 7.5 percent by weight solids.
Claim 3
Dependent Claim
17 words
The sizing composition of claim 1 wherein the alkoxy silane is gamma (ethylene diamine) propyl trimethoxy silane.
Claim 4
Dependent Claim
30 words
The size composition of claim 2 wherein the gamma (ethylene diamine) propyl trimethoxy silane is between 4 to 5 percent by weight basis the size ingredients exclusive of the water.
Claim 5
Dependent Claim
30 words
The size composition of claim 1 wherein the gamma (ethylene diamine) propyl trialkoxy silane is between 4 to 5 percent by weight of the size ingredients exclusive of the water.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |