Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1976-08-02
1977-04-26
Foelak, Morton
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
260 25B, 260 8, 264DIG9, 427222, B29D 2700
Patent
active
040201333
ABSTRACT:
A complex is formed by the reaction of an aluminum salt such as aluminum sulfate with a high molecular weight (for example, above 60,000 M.W.) collagen. Collagen-aluminum complex is dispersed in water and serves as suspension agent for suspending polystyrene beads during impregnation of a blowing agent, even when the concentration of the suspending agent is of the magnitude of 0.05% by weight of the beads. The aqueous system is drained from impregnated expandable beads, which are washed, but which retain adherent deposits of said collagen-aluminum complex in measurable amounts. The dried coated beads have minimized propensity toward lumping when pre-expanded. The prepuffed particles can pass tests concerned with resistance toward static electrical phenonomen better than corresponding prepuffed particles lacking such deposit of collagen-aluminum complex.
REFERENCES:
patent: 3301812 (1967-01-01), Ferrigno
patent: 3429737 (1969-02-01), Marsden
patent: 3908069 (1975-09-01), Muirhead
ARCO Polymers, Inc.
Ewbank John R.
Foelak Morton
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