Curable rubber bladder stocks having reduced viscosity

Details Curable rubber bladder stocks having reduced viscosity Curable rubber bladder stocks having reduced viscosity

1989-04-17

1990-07-24

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524316, 524317, 524321, 524574, C08K 511, C08K 900

Patent

active

049436090

ABSTRACT:
A curable rubber bladder stock containing esters of ricinoleic acid or derivatives thereof has reduced viscosity as compared to stocks containing castor oil. The rubber stocks of the present invention generally retain a very high percentage of the initial cure tensile strength and have improved modulus as compared to castor oil, both upon initial cure and upon aging. Lower viscosity and higher modulus of the rubber stocks of the present invention readily permit the production of thinner bladders. The bladders can fit within an article such as a tire during vulcanization of the tire as in an automatic vulcanizing press. Thinner bladders effect a greater heat rate and result in shorter cure times for articles such as tires. The esters of ricinoleic acid and derivatives thereof have the formula ##STR1## where R is H or ##STR2## where R.sup.1 is an aliphatic, preferably an alkyl, having from 1 to 12 carbon atoms, desirably from 1 to 4 carbon atoms, and preferably 1 carbon atom, i.e., methyl, and R.sup.2 is an aliphatic, desirably an alkyl, having from 1 to 12 carbon atoms and preferably from 1 to 4 carbon atoms.

REFERENCES:
patent: 3031423 (1962-04-01), Meier
patent: 4022848 (1977-05-01), Lukich
"Heat Resistant Studies of Resin Cured Butyl (Tire Curing Bladders)," by Enjay Polymer Laboratories.

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