Stock material or miscellaneous articles – Composite – Of polyamide
Patent
1973-05-14
1976-08-24
Hoag, Willard E.
Stock material or miscellaneous articles
Composite
Of polyamide
260 25B, 260 25M, 260 25HA, 264 457, 264 54, 264113, 264114, 264126, 264255, 264311, 264DIG5, 264DIG18, 428500, 428515, B29C 504, B29D 900, B29F 500, B29G 700
Patent
active
039768210
ABSTRACT:
A hollow multilayered article is rotationally molded by introducing into the mold particles of a hompolymer or copolymer of ethylene containing a crosslinking agent and heating the mold during rotation thereof to melt this first polymeric layer. Solid particles of a different polymer are then introduced into the mold at a time after at least substantially all of the particles of the first polymer have melted and prior to the time when the inner surface of the first layer would become smooth and glossy. The mold is then rotated and heated to melt the second polymer. The mold is then cooled and the multilayered article removed.
REFERENCES:
patent: 2659107 (1953-11-01), De Bell
patent: 2994919 (1961-08-01), Schafer et al.
patent: 2999780 (1961-09-01), Perrault
patent: 3214422 (1965-10-01), Mageli et al.
patent: 3297738 (1967-01-01), Mageli et al.
patent: 3449191 (1969-06-01), Taylor
patent: 3584105 (1971-06-01), Pekor
patent: 3652368 (1972-03-01), Formo
patent: 3818086 (1974-06-01), Stastny et al.
Sittig, Polyolefin Resin, Gulf Pub. Co., Housten (1961), pp. 3-6.
Floyd, Polyamide Resins, Reinhold, N.Y. (1962), pp. 3 & 111.
Carrow Guy E.
Rees Robert L.
Hoag Willard E.
Phillips Petroleum Company
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