초록 ▼

The detrimental effects of reinforcing fibers on the differential shrinkage and warpage characteristics of thermoplastic resins are substantially reduced by the incorporation of a silicone interpenetrating polymer network in fiber reinforced thermoplastic composites. High modulus (flexural modulus g

The detrimental effects of reinforcing fibers on the differential shrinkage and warpage characteristics of thermoplastic resins are substantially reduced by the incorporation of a silicone interpenetrating polymer network in fiber reinforced thermoplastic composites. High modulus (flexural modulus greater than 90,000 psi) thermoplastic matrices containing about 5 to 60 weight percent reinforcing fibers and 1 to 20 weight percent of a silicone IPN have reduced shrinkage and warpage and more isotropic mold shrinkage than conventional fiber reinforced thermoplastics, and are particularly useful in the melt forming of high tolerance parts, such as gears, as well as thin walled, variable thickness and thick cross section parts.

대표청구항 ▼

A melt processable composition comprising: a. a thermoplastic matrix material comprising a thermoplastic which has an unfilled flexural modulus greater than 90,000 psi; b. a hydride group-containing silicone and a component which will react with said hydride group-containing silicone, said silicone

A melt processable composition comprising: a. a thermoplastic matrix material comprising a thermoplastic which has an unfilled flexural modulus greater than 90,000 psi; b. a hydride group-containing silicone and a component which will react with said hydride group-containing silicone, said silicone and said component being selected and present in sufficient amounts to react with each other by vulcanization within said thermoplastic matrix to form a silicone semi-interpenetrating polymer network, said vulcanization of said silicone and said component being initiated during thermoplastic melt-processing of said silicone and said component with said matrix; and c. a fibrous reinforcing agent mixed with said matrix material, said silicone and or said component.