Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1974-12-20
1976-07-13
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264311, 264331, B29C 504
Patent
active
039694755
ABSTRACT:
A novel powder molding process for producing thermoplastic articles having improved surface properties and the molded articles produced thereby. Molding compositions comprising a thermoplastic polymer in the powder state and a curable additive selected from the reactive monomers and prepolymers thereof, which are liquid at the melting or softening temperatures of the thermoplastic polymers, are subjected to powder molding wherein the heating rate of the molding composition during the linear portion of the temperature-time curve after the initiation of melting or softening of the thermoplastic polymer is maintained at a very low rate, i.e., less than 25.degree.C. per minute. A curing agent may be added to the molding composition in order to control the curing time of the curable additives. The obtained thermoplastic articles have a cured thin surface layer of the curable additives, said surface layer being strongly combined with an inner layer of the thermoplastic articles.
REFERENCES:
patent: 2887728 (1959-05-01), Usab
patent: 3336244 (1967-08-01), Rockoff
Horiuchi Yasuo
Katsube Toraichi
Asahi Kasei Kogyo Kabushiki Kaisha
Thurlow Jeffery R.
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