US3670056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol fiber reinforced post-chlorinated polyvinyl chloride resins
Assignee: Air Products and Chemicals Inc
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Filing: 1970-12-28
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Granted: 1972-06-13
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Expires: 1990-12-28
Abstract
Abstract Post-chlorinated vinyl chloride resins including homopolymers of vinyl chloride and copolymers thereof with an olefin such as propylene, having high impact strength together with an adequate melt flow rate are prepared by incorporating polyvinyl alcohol fibers into the resin. The polyvinyl alcohol fibers are completely hydrolyzed, about one-eighth to one-half inch in length, about 1 to 10 denier and have a degree of polymerization in the range of 500 to 3,000.
Inventors
- 👤 Charles A Heiberger
- 👤 Henry O Mottern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:52
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/22; C08L27/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The resin of claim 1 wherein the fiber is about one-eighth to one-half inch in length.
Claim 2
Dependent Claim
23 words
The resin of claim 1 wherein the vinyl chloride resin prior to post-chlorination has an intrinsic viscosity of about 0.4 to 1.2 dl./g.
Claim 3
Dependent Claim
26 words
The resin of claim 3 wherein the post-chlorinated polyvinyl chloride resin is a copolymer of vinyl chloride and propylene containing 1 to 10 weight percent propylene.
Claim 4
Dependent Claim
16 words
The resin of claim 4 wherein the fiber is about one-eighth to one-half inch in length.
Claim 5
Dependent Claim
28 words
The resin of claim 1 wherein the fiber is about 4 to 8 denier and the polyvinyl alcohol has a degree of polymerization of about 1,200 to 2,400.
Claim 6
Dependent Claim
27 words
The resin of claim 1 wherein the polyvinyl alcohol is used in an amount of about 3 to 15 parts by weight per 100 parts of resin.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |