Patent US4021380A successfully refreshed from Google Patents.
US4021380A
Expired / Lapsed
US
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Expandable resin composition
Assignee: Mattel Inc
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Filing: 1976-02-27
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Granted: 1977-05-03
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Expires: 1996-02-27
Abstract
Abstract An expandable resin composition for puff molding shaped parts is disclosed. The composition includes a thermoplastic olefin resin such as ethylene-vinyl acetate (EVA), a solid thermally activatable blowing agent, a solid thermally activatable cross-linking agent and an inorganic metal salt such as zinc borate which provides a finished part with high temperature strength enabling removal of the shaped part from a hot mold without tearing the skin.
Inventors
- 👤 Fleet E. Nuttall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/101; C08J9/0066; C08K; C08K3/00; C08K3/38; C08K5/00; C08K5/04; C08K5/14; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/14; Y10S264/18; Y10S264/83
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
An expandable resin composition comprising a thermoplastic 1-olefin polymer containing an intimate dispersion of a solid thermally activated organic blowing agent, a solid thermally activatable organic cross-linking agent and a metal borate salt in an amount effective to reduce skin tearing on removal of an expanded part from a hot mold.
Claim 2
Dependent Claim
51 words
An expandable resin composition comprising a thermoplastic 1-olefin polymer containing an intimate dispersion of a solid thermally activated organic blowing agent, a solid thermally activatable organic cross-linking agent and a metal borate salt in an amount effective to reduce skin tearing on removal of an expanded part from a hot mold.
Claim 3
Dependent Claim
26 words
A composition according to claim 1 in which the 1-olefin polymer is selected from homopolymers of ethylene or copolymers containing from 5 to 40% vinyl comonomer.
Claim 4
Dependent Claim
26 words
A composition according to claim 2 in which the comonomer is vinyl acetate present in the copolymer in an amount from 15% to 25% by weight.
Claim 5
Dependent Claim
26 words
A composition according to claim 2 in which the blowing agent, cross-linking agent and borate salt are present in an amount between 5 to 20 phr.
Claim 6
Dependent Claim
18 words
A composition according to claim 4 in which said agents have a thermal activation temperature above 250° F.
Claim 7
Dependent Claim
27 words
A composition according to claim 5 in which the cross-linking agent is an organic peroxide present in the composition in an amount from 0.4 to 3.0 phr.
Claim 8
Dependent Claim
25 words
A composition according to claim 6 in which the peroxide is dicumyl peroxide present in the composition in an amount from 1 to 2 phr.
Claim 9
Dependent Claim
28 words
A composition according to claim 6 in which the organic blowing agent is an azo compound present in the composition in an amount from 2 to 7 phr.
Claim 10
Dependent Claim
25 words
A composition according to claim 8 in which the azo compound is azodicarbonamide present in the composition in an amount from 3 to 5 phr.
Claim 11
Dependent Claim
19 words
A composition according to claim 8 further including 1.0 to 7 phr of an activator for the blowing agent.
Claim 12
Dependent Claim
20 words
A composition according to claim 10 in which the activator is selected from zinc oxide, zinc stearate and mixtures thereof.
Claim 13
Dependent Claim
20 words
A composition according to claim 11 in which the ratio of zinc oxide to zinc stearate is at least 2/1.
Claim 14
Dependent Claim
21 words
A composition according to claim 5 in which the borate is a salt of a Group I or Group II metal.
Claim 15
Dependent Claim
20 words
A composition according to claim 13 in which the borate is present in an amount from 0.5 to 5 phr.
Claim 16
Dependent Claim
13 words
A composition according to claim 14 in which the borate is zinc borate.
References Cited (Backward Citations)
US3464934A
Cited
US3431203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |