US4394468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced polyoxymethylene molding compositions
Assignee: Celanese Corp
•
Filing: 1982-02-03
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Granted: 1983-07-19
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Expires: 2002-02-03
Abstract
Abstract Improved polyoxymethylene molding compositions comprising fiber reinforcement such as glass, wherein the fiber reinforcement is surface treated with a vinyl polymer, such as polyvinylacetate.
Inventors
- 👤 Shau-Zou Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:46
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; C08J2359/00; C08J2359/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
An improved fiber reinforced polyoxymethylene molding composition comprising the admixture of: (i) a polyoxymethylene polymer; and (ii) an effective amount of a fibrous reinforcement, wherein said fibrous reinforcement is surface treated with a vinyl polymer which is selected from the group consisting of polyvinylacetate, copolymers of vinyl acetate and other ethylenically unsaturated monomers and partially hydrolyzed vinyl acetate polymer.
Claim 2
Dependent Claim
59 words
An improved fiber reinforced polyoxymethylene molding composition comprising the admixture of: (i) a polyoxymethylene polymer; and (ii) an effective amount of a fibrous reinforcement, wherein said fibrous reinforcement is surface treated with a vinyl polymer which is selected from the group consisting of polyvinylacetate, copolymers of vinyl acetate and other ethylenically unsaturated monomers and partially hydrolyzed vinyl acetate polymer.
Claim 3
Dependent Claim
12 words
The composition according to claim 1 wherein said fibrous reinforcement is glass.
Claim 4
Dependent Claim
29 words
The composition according to claim 1 wherein the fibrous reinforcement is present in an amount of from about 5 to about 60 percent by weight of the total composition.
Claim 5
Dependent Claim
53 words
The composition of claim 1 wherein the polyoxymethylene polymer has an inherent viscosity of at least 0.8 (measured at 60° C. in a 0.1 weight percent solution in p-chlorophenol containing 2 weight percent of alpha-pinene), a weight average molecular weight of at least 35,000 and a melting point of at least 150° C.
Claim 6
Dependent Claim
15 words
The composition of claim 1 which further includes a high molecular weight thermoplastic phenoxy resin.
Claim 7
Dependent Claim
18 words
The composition of claim 1 which is stabilized by the addition of an antioxidant and an acid scavenger.
Claim 8
Dependent Claim
26 words
The composition of claim 4 wherein the phenoxy resin has the repeating structure: ##STR4## and a weight average molecular weight of from about 15,000 to 75,000.
Claim 9
Dependent Claim
16 words
The composition of claim 6 wherein the antioxidant is 2,2'-methylene-bis-(4-methyl-6-tertiary-butylphenol) and said acid scavenger is cyanoguanidine.
Claim 10
Dependent Claim
19 words
A fiber reinforced molded polyoxymethylene composite article exhibiting improved physical properties formed from the molding composition of claim 1.
Claim 11
Dependent Claim
16 words
The composition of claim 1 which further includes as an impact modifier a vinyl acetate resin.
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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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |