Improvements in or relating to gas expanded rubber substitutes and methods of producing the same

Abstract

Abstract 502,759. Porous or cellular synthetic resins; rubber. EXPANDED RUBBER CO., Ltd. Jan. 13, 1938, No. 1206. Convention date, July 9, 1937. [Class 70] [Also in Group IV] Rubber-like polymerization products of diolefines, isoprene, olefine polysulphide resins, rubber chloride and hydrochloride, capable of being plasticized, are rendered porous or cellular, by subjecting them to the action of an inert gas such as nitrogen under sufficient pressure (4,000 lb. per sq. in.) to effect penetration, and heating to expand the material and convert it into an unplasticizable state. Cellular material is produced by gassing at a raised temperature; cold gassing and subsequent heating without pressure, produces a porous mass. Plasticizers may be added to assist in forming the initial plastic mass. In an example, 2 chlor 1, 3 butadiene plasticizable polymer is milled as rapidly as possible with plasticizers and fillers, and placed in an autoclave into which nitrogen is forced at a pressure of 4,000 lb. per sq. in. The 'gassing may proceed for 1¢ hours at 200‹ F., or longer at a lower temperature. In the latter event, heating to 212-260‹ F., for 5-30 min. will polymerize the mass sufficiently to retain the gas and give a cellular structure. The mix is then placed in moulds and heated to produce expansion and complete the polymerization.

Inventors

No inventors recorded.

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