US4228250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of hydrolyzed ethylene-vinyl acetate resins having increased impact strength
Assignee: Equistar Chemicals LP
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Filing: 1979-06-28
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Granted: 1980-10-14
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Expires: 1999-06-28
Abstract
Abstract Resin blends containing hydrolyzed ethylene-vinyl acetate resin and demonstrating improved impact-resistance properties compared to the unblended hydrolyzed ethylene-vinyl acetate resin are obtained by blending (a) as host resin, a copolymer/terpolymer of ethylene, vinyl acetate and vinyl alcohol in which ethylene is present at from about 2 to about 60 weight percent, vinyl acetate is present at from 0 to about 10 weight percent and vinyl alcohol is present at about 98 to about 40 weight percent, with (b) an impact-resistance-increasing amount of an impact modifying resin which is a partially hydrolyzed ethylene-vinyl acetate copolymer in which ethylene is present at about 25 to about 70 weight percent, vinyl acetate is present at about 20 to about 70 weight percent and vinyl alcohol is present at about 0.5 to about 25 weight percent.
Inventors
- 👤 Ervin G. Pritchett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; C08L2205/00; C08L2205/02; C08L23/00; C08L23/02; C08L23/04; C08L23/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A resin blend demonstrating improved impact-resistance which comprises (a) as host resin, a hydrolyzed ethylene-vinyl acetate copolymer in which ethylene is present at from about 2 to about 60 weight percent, vinyl acetate is present at from about 0 to about 10 weight percent, and vinyl alcohol is present at about 98 to about 40 weight percent, blended with (b) an impact-resistance-increasing amount of an impact modifying resin which is a partially hydrolyzed ethylene-vinyl acetate copolymer in which ethylene is present at about 25 to about 70 weight percent, vinyl acetate is present at about 20 to about 70 weight percent and vinyl alcohol is present at about 0.5 to about 25 weight percent.
Claim 2
Dependent Claim
114 words
A resin blend demonstrating improved impact-resistance which comprises (a) as host resin, a hydrolyzed ethylene-vinyl acetate copolymer in which ethylene is present at from about 2 to about 60 weight percent, vinyl acetate is present at from about 0 to about 10 weight percent, and vinyl alcohol is present at about 98 to about 40 weight percent, blended with (b) an impact-resistance-increasing amount of an impact modifying resin which is a partially hydrolyzed ethylene-vinyl acetate copolymer in which ethylene is present at about 25 to about 70 weight percent, vinyl acetate is present at about 20 to about 70 weight percent and vinyl alcohol is present at about 0.5 to about 25 weight percent.
Claim 3
Dependent Claim
44 words
The resin blend of claim 1 in which host resin (a) contains from about 5 to about 50 weight percent ethylene, from 0 to less than about 5 weight percent vinyl acetate and from above about 95 to about 50 weight percent vinyl alcohol.
Claim 4
Dependent Claim
43 words
The resin blend of claim 1 in which impact modifying resin (b) contains from about 30 to about 65 weight percent ethylene, from about 25 to about 65 weight percent vinyl acetate and from about 1 to about 20 weight percent vinyl alcohol.
Claim 5
Dependent Claim
28 words
The resin blend of claim 1 in which the impact modifying resin (b) is present at from about 5 to about 30 weight percent of host resin (a).
Claim 6
Dependent Claim
43 words
The resin blend of claim 2 in which impact modifying resin (b) contains from about 30 to about 65 weight percent ethylene, from about 25 to about 65 weight percent vinyl acetate and from about 1 to about 20 weight percent vinyl alcohol.
Claim 7
Dependent Claim
19 words
The resin blend of claim 1 in which impact modifying resin (b) contains an alkali metal carboxylic acid salt.
Claim 8
Dependent Claim
20 words
The resin blend of claim 6 in which the alkali metal carboxylic acid salt is sodium acetate or potassium acetate.
Claim 9
Dependent Claim
16 words
The resin blend of claim 1 in which impact modifying resin (b) contains a crosslinking agent.
Claim 10
Dependent Claim
14 words
The resin blend of claim 8 in which the cross-linking agent is boric acid.
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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |