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
Estimating the term…
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) from 200 to 4,000 parts per million of at least one polyethylene glycol based on the weight the linear polyethylene;
- and
- iii) from 3.0 to 15.0 weight percent of a high pressure low density polyethylene (LDPE) based on the total weight of the linear polyethylene and the high pressure LDPE;
- wherein the linear polyethylene is selected from the group consisting of linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), 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) from 200 to 4,000 parts per million of at least one polyethylene glycol based on the weight the linear polyethylene;
- and
- iii) from 3.0 to 15.0 weight percent of a high pressure low density polyethylene (LDPE) based on the total weight of the linear polyethylene and the high pressure LDPE;
- 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), 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 4,000 parts per million of at least one polyethylene glycol, based on the weight of the linear polyethylene and ii) from 3.0 weight percent to 15.0 weight percent of a high pressure low density polyethylene (LDPE) based on the total weight of the linear polyethylene and the high pressure LDPE;
- 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), 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.