US 4,938,910 AGranted

Mandrel for production of rubber hose

AssigneeMitsui Petrochemical Industries, Ltd.

InventorsShunji Abe, Hiromi Shigemoto

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Abstract

A mandrel suitable for use in the production of a rubber hose formed from a composition comprising: (i) at least one member selected from the group consisting of (A) an ethylene-alpha-olefin random copolymer having an ethylene content of 10 to 95 mol % and a degree of crystallinity, based on X-ray determination, of 0 to 20%, (B) a propylene - C.sub.4 to C.sub.10 alpha-olefin random copolymer having a propylene content of 50 to 80 mol % and a crystal fusion heat amount, determined by a differential scanning calorimeter, of 0 to 80 Joule/g, and (C) an oligomer having the general formula: ##STR1## wherein n and p are independently zero or an integer, m is zero or 1, and R is ##STR2## and (ii) 98% to 30% by weight of a 4-methyl-1-pentene polymer, wherein the weight ratio of the component (i) to the component (ii) is from 2:98 to 70:30. This mandrel has excellent dimensional stability, durability, heat resistance, and releasability.

Claims7

Dependent claims

A method of producing a rubber hose comprising the steps of:

(a) applying unvulcanized rubber on a mandrel said mandrel formed from a composition comprising:
(i) at least one ethylene-alpha-olefin random oligomer-like copolymer having an ethylene content of 40 to 95 mole % and a degree of crystallinity, based on X-ray determination, of 0 to 20%, wherein the number-average molecular weight of the random oligomer-like copolymer is within the range of from 300 to 5,000, and
(ii) 4-methyl-1-pentene polymer, wherein the weight ratio of the component (i) to the component (ii) is from 2:98 to 70:30;
(b) coating said unvulcanized rubber on said mandrel with a cover material;
(c) rolling up said mandrel together with said unvulcanized rubber and the cover material to obtain an unvulcanized rubber assemble;
(d) vulcanizing the unvulcanized rubber assemble by heating in a vulcanization apparatus;
(e) removing the cover material from the resultant vulcanized product;
and
(f) pulling out the mandrel from the resultant vulcanized rubber hose product.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/195,358Filed 16 May 1988 · continuation
Priority: JP 58-12465711 Jul 1983
Granted: 3 Jul 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

C08L 15/00
Compositions of rubber derivatives
B29C 33/40
Characterised by the material or the manufacturing process: plastics, e.g. foam or rubber
C08L 23/16
Not modified by chemical after-treatment: ethylene-propylene or ethylene-propylene-diene copolymers
C08L 23/20
Homopolymers or copolymers of hydrocarbons having four or more carbon atoms: having four to nine carbon atoms