US4123477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinylidene chloride resin compositions
Assignee: Asahi Dow Ltd
•
Filing: 1977-11-04
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Granted: 1978-10-31
•
Expires: 1997-11-04
Abstract
Abstract Greatly improved heat and light resistance is imparted to polyvinylidene chloride resins by incorporating therein a specific chlorinated ethylene-vinyl ester copolymer to minimize the quantities in said resins of conventional additives, of which migration is undesirable from a viewpoint of food hygiene. The resulting polyvinylidene chloride resin compositions also have excellent gas barrier properties and high transparency.
Inventors
- 👤 Takeshi Watanabe
- 👤 Kenichiro Kodama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:09
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/08; C08L23/00; C08L23/26; C08L23/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A polyvinylidene chloride resin composition, which comprises 100 parts by weight of (A) a copolymer of 75 to 75% by weight of vinylidene chloride and 25 to 5% by weight of a monomer copolymerizable with vinylidene chloride and 3 to 60 parts by weight of (B) a chlorinated ethylene-vinyl ester copolymer containing 10 to 40% by weight (based on unchlorinated ethylene-vinyl ester copolymer) of a vinyl ester and 3 to 55% by weight (based on chlorinated ethylene-vinyl ester copolymer) of chlorine.
Claim 2
Dependent Claim
81 words
A polyvinylidene chloride resin composition, which comprises 100 parts by weight of (A) a copolymer of 75 to 75% by weight of vinylidene chloride and 25 to 5% by weight of a monomer copolymerizable with vinylidene chloride and 3 to 60 parts by weight of (B) a chlorinated ethylene-vinyl ester copolymer containing 10 to 40% by weight (based on unchlorinated ethylene-vinyl ester copolymer) of a vinyl ester and 3 to 55% by weight (based on chlorinated ethylene-vinyl ester copolymer) of chlorine.
Claim 3
Dependent Claim
22 words
A polyvinylidene chloride resin composition as in claim 1, wherein the copolymer (A) is a copolymer of vinylidene chloride and vinyl chloride.
Claim 4
Dependent Claim
20 words
A polyvinylidene chloride resin composition as in claim 1, wherein the chlorinated ethylene-vinyl ester copolymer is chlorinated ethylene-vinyl acetate copolymer.
Claim 5
Dependent Claim
67 words
A polyvinylidene chloride resin composition as in claim 1, wherein the chlorinated ethylene-vinyl ester copolymer contains vinyl ester and chlorine in such proportions to satisfy the following relationship: -0.7 X + 31 ≦ Y ≦ -X + 80 wherein X is vinyl ester content (% by weight based on unchlorinated ethylene-vinyl ester copolymer) and Y is chlorine content (% by weight based on chlorinated ethylene-vinyl ester copolymer).
Claim 6
Dependent Claim
14 words
A transparent molded article comprising a polyvinylidene chloride resin composition as in claim 1.
Claim 7
Dependent Claim
14 words
A transparent molded article as in claim 5, which is an inflation molded film.
References Cited (Backward Citations)
US3076781A
Cited
US3145187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |