US3856719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing foamed thermoplastic resin articles
Assignee: JSP Corp
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Filing: 1972-12-05
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Granted: 1974-12-24
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Expires: 1992-12-05
Abstract
Abstract A foamed thermoplastic resin article is obtained from a ternary component system thermoplastic resinous composition consisting of 100 parts by weight of a low density polyethylene or an ethylene copolymer and from 10 to 60 parts by weight, more preferably, from 15 to 40 parts by weight of modifying polymers of (A) a polystyrene type resin and (B) a high density polyethylene. The amount of (B) is from 6 to 40 % by weight, more preferably, from 10 to 35 % by weight based on the total amount of (A) and (B). The foamed article, shaped either in sheet, rod or net, etc. produced this resinous composition exhibits no substantial shrinkage after molding. It is also excellent in flexibility as well as in elasticity.
Inventors
- 👤 T Noguchi
- 👤 I Ohtsuka
- 👤 A Miyamoto
- 👤 H Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:10
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08J2425/00; C08J2425/02; C08J2425/04; C08J2425/06; Y; Y10; Y10S; Y10S521/00; Y10S521/908; Y10S521/91
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
A PROCESS FOR PRODUCING A FORMED ARTICLE OF THERMOPLASTIC RESIN BY EXTRUDING INTO A LOW PRESSURE ZONE, A MOLTEN THERMOPLASTIC RESIN COMPOSITION, WITH OR WITHOUT A NUCLEATING AGENT, SAID COMPOSITION CONTAINING AT LEAST ONE ORGANIC FOAMING AGENT OF A SATURATED HYDROCARBON, A HALIDE THEREOF OR AN ETHER, WHICH IS NORMALLY GASEOUS OR LIQUID AND HAVING A BOILING POINT OF FROM -45*C TO 70*C, WHICH COMPRISES USING, AS SAID THERMOPLASTIC RESIN COMPOSITION, A COMPOSITION CONSISTING ESSENTIALLY OF I. 100 PARTS BY WEIGHT OF A LOW DENSITY POLYETHYLENE OR A COPOLYMER THEREOF WITH A VINYL MONOMER, SAID COPOLYMER CONTAINING AT LEAST 80 MOLE % OF ETHYLENE AS A MONOMER UNIT, AND II. FROM 10 TO 60 PARTS BY WEIGHT OF (A) A POLYSTYRENE CONTAINING RESIN CONTAINING AT LEAST 50% BY WEIGHT POLYSTYRENE AND (B) A HIGH DENSITY POLYETHYLENE, THE AMOUNT OF (B) BEING FROM 6 TO 40% BY WEIGHT BASED ON THE TOTAL OF (A) AND (B).
Claim 2
Dependent Claim
155 words
A PROCESS FOR PRODUCING A FORMED ARTICLE OF THERMOPLASTIC RESIN BY EXTRUDING INTO A LOW PRESSURE ZONE, A MOLTEN THERMOPLASTIC RESIN COMPOSITION, WITH OR WITHOUT A NUCLEATING AGENT, SAID COMPOSITION CONTAINING AT LEAST ONE ORGANIC FOAMING AGENT OF A SATURATED HYDROCARBON, A HALIDE THEREOF OR AN ETHER, WHICH IS NORMALLY GASEOUS OR LIQUID AND HAVING A BOILING POINT OF FROM -45*C TO 70*C, WHICH COMPRISES USING, AS SAID THERMOPLASTIC RESIN COMPOSITION, A COMPOSITION CONSISTING ESSENTIALLY OF I. 100 PARTS BY WEIGHT OF A LOW DENSITY POLYETHYLENE OR A COPOLYMER THEREOF WITH A VINYL MONOMER, SAID COPOLYMER CONTAINING AT LEAST 80 MOLE % OF ETHYLENE AS A MONOMER UNIT, AND II. FROM 10 TO 60 PARTS BY WEIGHT OF (A) A POLYSTYRENE CONTAINING RESIN CONTAINING AT LEAST 50% BY WEIGHT POLYSTYRENE AND (B) A HIGH DENSITY POLYETHYLENE, THE AMOUNT OF (B) BEING FROM 6 TO 40% BY WEIGHT BASED ON THE TOTAL OF (A) AND (B).
Claim 3
Dependent Claim
31 words
The process according to claim 1 wherein the amount of (A) and (B) is from 15 to 40 parts by weight to 100 parts by weight of a low density polyethylene.
Claim 4
Dependent Claim
27 words
The process according to claim 1 wherein the amount of (B) is from 10 to 35 % by weight based on the total of (A) and (B).
Claim 5
Dependent Claim
27 words
The process according to claim 2 wherein the amount of (B) is from 10 to 35 % by weight based on the total of (A) and (B).
Claim 6
Dependent Claim
25 words
The process according to claim 1 wherein the component (I) is ethylene-vinyl acetate copolymer containing at least 80 mole % of the ethylene monomer unit.
Claim 7
Dependent Claim
18 words
The process according to claim 1 wherein the polystyrene containing resin is polystyrene or high impact polystyrene resin.
Claim 8
Dependent Claim
25 words
The process according to claim 2, wherein the component (I) is an ethylene-vinylacetate copolymer containing at least 80 mole % of the ethylene monomer unit.
Claim 9
Dependent Claim
17 words
The process according to claim 2, wherein the polystyrene containing resin is polystyrene or high impact polystyrene.
Claim 10
Dependent Claim
94 words
An article formed into any shape from a foamed thermoplastic resin, consisting essentially of, I. 100 parts by weight of a low density polyethylene or a copolymer thereof with a vinyl monomer, said copolymer containing at least 80 mole % of ethylene as a monomer unit, and II. from 10 to 60 parts by weight of (A) a polystyrene containing resin containing at least 50% by weight polystyrene and (B) a high density polyethylene, the amount of (B) being from 6 to 40 % by weight based on the total of (A) and (B).
Claim 11
Dependent Claim
94 words
An article formed into any shape from a foamed thermoplastic resin, consisting essentially of, I. 100 parts by weight of a low density polyethylene or a copolymer thereof with a vinyl monomer, said copolymer containing at least 80 mole % of ethylene as a monomer unit, and II. from 10 to 60 parts by weight of (A) a polystyrene containing resin containing at least 50% by weight polystyrene and (B) a high density polyethylene, the amount of (B) being from 6 to 40 % by weight based on the total of (A) and (B).
Claim 12
Dependent Claim
10 words
The article according to claim 9, formed into a net.
Claim 13
Dependent Claim
33 words
The article of claim 9, wherein the low density polyethylene has a density of from 0.910 to 0.930 g/cc, and the high density polyethylene has a density of from 0.941 to .0970 g/cc.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |