Molded rubber products

Details Molded rubber products Molded rubber products

1986-09-25

1988-01-26

Lieberman, Allan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525282, 5253341, 525373, 525375, 264275, 264325, C08L 900, C08L 1502, C08K 534, C08K 322

Patent

active

047217561

ABSTRACT:
A method of producing a molded rubber product for use in the pharmaceutical industry comprising the steps of mixing a rubber formulation including a halogenated butyl rubber and a curing system of from 0.5 to 2.0 parts by weight of zinc oxide and from 0.5 to 1.5 parts by weight of m-PBM. The parts are based upon the weight of the formulation. A sheet is formed from the mixture by feeding the mixture through a calender means. The calender sheet is molded into a molded rubber product at a pressure of at least 500 psi and at a temperature of up to 375.degree. F. for up to 5 minutes. The formed product is then removed.

REFERENCES:
patent: 3334075 (1967-08-01), Kehn
patent: 4020039 (1977-04-01), Dunn et al.
Ruppe et al, "A Curing Agent for `Hypalon` and Coagent Peroxide Cure Systems", Du Pont Product Brochure HVA-2.
Vukov et al, "Crosslinking Efficiency of Some Halobutyl Curing Reactions," paper presented at ACS Rubber Division Meeting, Denver, Colo., Oct. 23-26, 1984.

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