×

Tire curing bladder with improved release characteristics

  • US 5,580,513 A
  • Filed: 07/14/1995
  • Issued: 12/03/1996
  • Est. Priority Date: 07/14/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. In a curing press for a rubber composition of the type which uses an expandable bladder to assist in shaping and curing said rubber composition wherein the bladder is a molded crosslinked formulation includingone or more rubbery polymers, wherein at least 50 weight percent of said rubbery polymers of said bladder are at least one isobutylene rubbery polymer having at least 80 weight percent repeat units from isobutylene;

  • one or more curatives for said one or more rubbery polymers;

    the improvement wherein the bladder further comprises from about 1 to about 20 parts by weight of corn oil dispersed throughout said bladder formulation and wherein said corn oil reduces the Hot Peel Adhesion value of the crosslinked bladder formulation at least 10 percent as compared to the same bladder formulation without said corn oil;

    at least 10 weight percent of said at least one isobutylene rubbery polymer is one or more copolymers of isobutylene and a para-alkylstyrene; and

    wherein said parts by weight are based on 100 parts by weight of the rubbery polymers in said bladder formulation.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×