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US 4,731,122 AGranted
Process for manufacturing a thermoplastic molding composition
AssigneeAlza Corporation
InventorsRichard Cortese, Jeremy C. Wright, James B. Eckenhoff, David L. Rivera
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Abstract
The invention concerns a process for producing a thermoplastic composition comprising a cellulose ester.
Claims3
A process for the manufacture of a thermoplastic composition, wherein the composition comprises:
- at least one member selected from the group consisting of cellulose acetate butyrate and cellulose acetate, at least one of a member selected from the group consisting of tributyl citrate and triethyl citrate and wherein the process sequentially comprises:
- comminuting cellulose acetate butyrate to a smaller particle size;
- blending at least one member of tributyl citrate, and triethyl citrate, and polyethylene glycol to a uniform blend;
- adding the comminuted cellulose acetate butyrate to the continuously mixing blend;
- adding the cellulose acetate to the blending ingredient and blend to produce a homogeneous thermoplastic composition;
- compacting the thermoplastic composition to produce a compacted composition;
- and, granulating the compacted composition into granules sized for use in a molding machine.
4 more elements
A process for producing a thermoplastic molding composition, wherein the process comprises the steps of:
- mixing tributyl citrate, triethyl citrate and polyethylene glycol to yield a first mixture;
- adding to the mixing first mixture cellulose acetate butyrate to produce a second mixture;
- adding to the mixing second mixture cellulose acetate to produce a thermoplastic composition comprising cellulose acetate butyrate, cellulose acetate, tributyl citrate, triethyl citrate and polyethylene glycol;
- compacting the thermoplastic composition into a compacted mass;
- and grinding the compacted composition into particles sized for admittance into a molding machine.
2 more elements
Dependencies are inferred from the claim text.