Fluoropolymer free polymer processing aids
AssigneeNOVA Chemicals (International) S.A.
InventorsJared Taylor, Tony Tikuisis, P. Scott Chisholm, Norman Aubee, Douglas Checknita
Life of this patent
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Abstract
A polymer processing aid (PPA) reduces melt defects in extruded polyolefins in the absence of fluoropolymers. The polymer processing aid comprises a polyalkylene glycol such as a polyethylene glycol together with a high pressure low density polyethylene (LDPE) and reduces melt defects well in a thermoplastic polyolefin such as a linear low density polyethylene (LLDPE).
Claims38
A process for preparing a thermoplastic composition extrudate, the process comprising extruding a thermoplastic composition in a melt extrusion process;
- the thermoplastic composition comprising:
- i) a linear polyethylene;
- ii) a first polyethylene glycol having a weight average molecular weight, Mw of from 2,000 to 10,000 g/mol;
- and
- iii) a second polyethylene glycol having a weight average molecular weight, Mw of from 15,000 to 50,000 g/mol;
- wherein the linear polyethylene is selected from the group consisting of linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and very low density polyethylene (VLDPE), high density polyethylene (HDPE), and mixtures thereof,
- wherein the thermoplastic composition is substantially free of fluoropolymers;
- and
- wherein the melt extrusion process is carried out in the absence of fluoropolymers.
An extrudable thermoplastic composition comprising:
- i) a linear polyethylene;
- ii) a first polyethylene glycol having a weight average molecular weight, Mw of from 2,000 to 10,000 g/mol;
- and
- iii) a second polyethylene glycol having a weight average molecular weight, Mw of from 15,000 to 50,000 g/mol;
- wherein the extrudable thermoplastic composition is substantially free of fluoropolymers;
- and
- wherein the linear polyethylene is selected from the group consisting of linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and very low density polyethylene (VLDPE), high density polyethylene (HDPE), and mixtures thereof.
A process for preparing a thermoplastic composition extrudate, the process comprising:
- a) preparing a thermoplastic composition by combining a linear polyethylene with i) 200 to 2,000 parts per million (based on the weight of the linear polyethylene) of a first polyethylene glycol having a weight average molecular weight, Mw of from 2,000 to 10,000 g/mol;
- and ii) 200 to 2000 parts per million (based on the weight of the linear polyethylene) of a second polyethylene glycol having a weight average molecular weight, Mw of from 15,000 to 50,000 g/mol;
- and
- b) extruding the thermoplastic composition in a melt extrusion process;
- wherein the linear polyethylene is selected from the group consisting of linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and very low density polyethylene (VLDPE), high density polyethylene (HDPE), and mixtures thereof,
- wherein the thermoplastic composition is substantially free of fluoropolymers;
- and
- wherein the melt extrusion process is carried out in the absence of fluoropolymers.
Dependencies are inferred from the claim text.