Compositions and methods for use in plastics manufacturing
Assignee.
InventorsCharles B. Irish, Paul S. Maguire, Stephen B. Maguire
Life of this patent
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Abstract
Compositions and methods for making biodegradable plastic products are provided. The compositions include a destabilizing agent that makes the finished plastic biodegradable. The compositions also can include an oil-based carrier, such as cottonseed oil, that allows the biodegrading agent to be metered into a continuous plastic manufacturing process. The compositions further can include an additive that allows the biodegrading additive to combine with the carrier; an optical brightener to improve the appearance of the finished plastic product, and to indicate the presence of the composition in the finished product; and a pigment, so that the composition can act as a liquid coloring agent.
Claims33
A composition for use in molding or extruding plastic products, comprising a liquid carrier and a destabilizer.
A liquid colorant for use in manufacturing plastics, comprising:
- a destabilizer;
- a liquid carrier;
- and pigment.
A method of molding or extruding plastic parts comprising the steps of:
- a) providing a quantity of destabilizer;
- b) providing a quantity of liquid carrier;
- c) combining the destabilizer and the liquid carrier to produce a composition;
- and
- d) adding the composition to thermoplastic resin in the course of molding or extrusion.
A method of molding or extruding plastic parts comprising the steps of:
- a) providing a collection of pigments in powder form;
- b) providing a quantity of cottonseed oil;
- c) providing a quantity of destabilizer;
- d) creating a plurality of single pigment dispersions each in a cottonseed oil carrier, the cottonseed oil carrier comprising the cottonseed oil and the destabilizer;
- e) blending selected ones of the single pigment dispersions to create a blend of a desired color shade;
- f) milling the blend;
- and
- g) adding the blend to thermoplastic resin in the course of molding or extrusion.
A method of making liquid color for use in the course of molding or extruding plastic parts comprising the steps of:
- a) providing a collection of pigments in powder form;
- b) providing a quantity of cottonseed oil;
- c) providing a quantity of destabilizer;
- d) creating a plurality of single pigment dispersions, each in a cottonseed oil carrier;
- the cottonseed oil carrier comprising the cottonseed oil and the destabilizer;
- e) blending selected ones of the single pigment dispersions to create a blend of a desired color shade;
- and
- f) milling the blend.
A method of fabricating plastic products having a preselected color, comprising:
- a) preparing a dispersion of pigment of the preselected color in cottonseed oil and destabilizer;
- b) supplying a preselected plastic resin for the product to be fabricated to a process machine having a rotating screw;
- c) furnishing the dispersion to the process machine at a position adjacent to threaded portion of the rotating screw;
- and
- d) blending the dispersion and the resin by rotating the screw.
Dependencies are inferred from the claim text.