Process for producing stabilized non-woven thermoplastic composi

Details Process for producing stabilized non-woven thermoplastic composi Process for producing stabilized non-woven thermoplastic composi

1994-01-18

1995-11-21

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

With reshaping or surface embossing of formed article

264112, 264122, 264134, B29C 5902

Patent

active

054684374

ABSTRACT:
A process is provided for producing a fiber reinforced thermoplastic sheet. The process involves the steps of forming a dilute aqueous slurry of organic polymer particulates and reinforcing fibers, collecting the particulates and fibers in the form of a continuous mat by dewatering the slurry over a porous substrate, applying a stabilizer composition to a surface of the solid mat, stamping of the mat at an elevated pressure and temperature to consolidate the organic polymer particulates and yield a solid sheet-like structure. The process provides for efficient application of the stabilizer composition by applying it to the mat separately from the formation of the slurry, and in the case of ultraviolet light stabilizers and absorbers, the process applies the stabilizers to the surface of the mat where they are most needed.

REFERENCES:
patent: 3716449 (1973-02-01), Gatward et al.
patent: 4056501 (1977-11-01), Gibbs et al.
patent: 4323531 (1981-04-01), Bradley et al.
patent: 4393106 (1981-10-01), Maruhashi et al.
patent: 4426470 (1982-09-01), Wessling et al.
patent: 5190204 (1991-01-01), Katoh et al.

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