Research/Patents/US 5644000
US 5644000

CRYSTALLIZATION RESISTANT, LOW MODULUS ELASTOMER FOR FLEXIBLE BEARINGS

Assignee

MORTON THIOKOL, INC.

Filed

Mar 10, 1989

Granted

Jul 1, 1997

Location

TREMONTON UT US

Abstract

A low shear modulus vulcanizate for construction of flexible bearings, particularly for rocket motors, consisting essentially of a mixture of two natural or synthetic rubber copolymers, the first having about 92% cis-1,4-polyisoprene and about 8% trans-1,4-polyisoprene moieties and the second having about 98% by weight cis-1,4-polyisoprene and about 2% by weight trans-1,4-polyisoprene moieties. The composition is lightly filled and contains a low proportion of sulfur, so the vulcanizate has the required low shear modulus, low rate of thermal crystallization at low temperatures, and an acceptably high shear strength.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Oct 19, 1989

Rescinded

May 23, 1994

Duration

4 years, 7 months

Inventor

  • 1DAVID G. GUILLOT

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records