초록 ▼

The invention is concerned with a process for forming a unitary seal comprising a support section formed of a high modulus, i.e. rigid high impact strength plastic and a sealing section formed of an elastomeric material, the support and sealing section being directly bonded together without the use

The invention is concerned with a process for forming a unitary seal comprising a support section formed of a high modulus, i.e. rigid high impact strength plastic and a sealing section formed of an elastomeric material, the support and sealing section being directly bonded together without the use of an adhesive therebetween to form the unitary seal. The process comprises contacting a surface portion of the support section directly with a surface portion of the sealing section, under sufficient pressure to assure a pressed contact therebetween, with the sections at a temperature of 50°C.-400°C. for a time sufficient to cause bonding between the contacting surface portions to form the unitary seal.

대표청구항 ▼

A process for the injection molding of a unitary seal having a support section formed of a high modulus rigid polycarbonate plastic and a sealing section formed of a polyurethane elastomeric material, consisting essentially of: injecting sufficient polycarbonate, heated on a temperature from about 2

A process for the injection molding of a unitary seal having a support section formed of a high modulus rigid polycarbonate plastic and a sealing section formed of a polyurethane elastomeric material, consisting essentially of: injecting sufficient polycarbonate, heated on a temperature from about 200°C. to about 400°C., into a first injection mold to fill said first injection mold; retaining said polycarbonate in said first injection mold for a time sufficient to allow solidification of said polycarbonate and formation thereof into said support section; forming a second injection mold with a surface portion of said support section defining a portion of the surface of said second injection mold; injecting polyurethane elastomer, heated to a temperature from about 150°C. to about 300°C., into said second injection mold in a sufficient amount to fill said second injection mold; confining said polyurethane elastomer in said second injection mold for a time sufficient to allow solidification thereof into said sealing section; and retaining said second mold intact under sufficient pressure to retain a pressed contact between said surface portion of said support section and a mating surface portion of said sealing section, while maintaining said sections at a temperature from about 50°C. to about 400°C. for a time sufficient to cause a bonding between said contacting surface portions to form said unitary seal.