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US 5,334,644 AGranted
Aqueous additive systems, methods and polymeric particles
AssigneeEastman Chemical Company
InventorsWilliam C. Gose, Kenneth W. Hyche
Life of this patent
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Abstract
Aqueous application systems for applying additives to polymeric particles, methods of preparing aqueous emulsions which include at least one processing, stabilizing or other functional polymer additive and an emulsifiable wax. Also disclosed are methods of applying additives to polymeric particles and to polymeric particles treated by such methods.
Claims8
A method of applying additives to polymeric particles comprising contacting said particles with an aqueous system free from in situ formation of color producing complexes comprising:
- a) an emulsified wax,
- b) in the range of 0.025 up to 60 parts by weight of surfactant per part of emulsified wax,
- c) in the range of 0.005 up to 2 parts by weight of a base per part of emulsified wax, with a pH in the range of greater than 7 to equal to or less than about 12,
- d) in the range of 0.05 up to 160 parts by weight of at least one processing, stabilizing or other functional polymer additive, per part of emulsified wax, and
- e) at least enough water to render the resulting combination fluid;
- and
- drying said particles wherein said particles are produced from polymers selected from the group consisting of polyolefins, polyimides, polyamides, polystyrene, polyethylene terephthalate, and acrylonitrile-butadiene-styrene.
4 more elements
A method of applying additives to polymeric particles comprising
- contacting said particles with an aqueous emulsion which includes an emulsifiable wax and at least one processing, stabilizing or other functional polymer additive component, prepared according to the method comprising:
- (1) agitating a mixture which contains by weight, about 20 to about 80 percent water, about 5 to about 35 percent of an emulsifiable wax, about 0.2 to about 1.0 percent of a base, and about 2 to about 30 percent of a surfactant, at a temperature sufficient to melt all solids;
- and under a pressure sufficient to prevent boiling for a period of time to ensure homogeneity;
- (2) cooling said emulsion to ambient temperature;
- and
- (3) milling in the range of 20 up to 70 wt % of the cooled emulsion within the range of about 30 up to 80 wt % of said additive component optionally with 0-35 wt % water, and optionally with 0-1 wt % antifoam for a period of time to ensure substantial homogeneity;
- and
- drying said particles wherein said polymeric particles are selected from the group consisting of polyolefins, polyimides, polyamides, polystyrene, polyethylene terephthalate, and acrylonitrile-butadiene-styrene.
5 more elements
Dependencies are inferred from the claim text.