Patent ID: 9611771
Date: 2017-04-04
CPC Classifications: B32B,F01N,Y10T

Claim:
1. A muffler for internal combustion engines comprising: (a) a hollow body having an inlet opening and an outlet opening, (b) an inlet pipe extending into the hollow body through the inlet opening (c) an outlet pipe extending out of the hollow body through the outlet opening, wherein the hollow body is formed by a material comprising a fiber lining and a composite structure, and wherein from 0.5 to 50 percent of the fiber lining penetrates the composite structure, based on the thickness of the fiber lining, and wherein the composite structure comprises (iv) a surface having at least a portion thereof made of a surface resin composition; and (v) a core comprising a fibrous material impregnated with a matrix resin composition, wherein the surface resin composition and the matrix resin composition are polyamide compositions comprising one or more polyamide resins.