IMPROVED POLYOLEFIN COMPOSITION FOR VEHICLE NOISE VIBRATION AND HARSHNESS APPLICATIONS

摘要

The present invention relates to polyolefin compositions useful as sound-deadening sheeting for formed vehicle applications. Said polyolefin composition comprises a physical mixture of a filled polyolefin and a functionalized polyethylene wherein the filled polyolefin comprises an elastomer, preferably one or more linear ethylene polymer and/or substantially linear polymer and a filler, preferably calcium carbonate. Said composition demonstrates a good balance of melt strength and elongation such that it is particularly suitable for sheet extrusion and thermoforming articles therefrom.

主权项

1. A polyolefin composition comprising a physical mixture of:
(A) from 97 to 90 parts by weight of a filled polyolefin composition comprising
(1) from 5 to 40 weight percent of at least one linear ethylene polymer and/or substantially linear ethylene polymer having:
(i) a density from 0.85 g/cm3 to 0.93 g/cm3,(ii) a molecular weight distribution (Mw/Mn) of less than 3.5,and(iii) a melt index (I2) of from 0.1 grams/10 minutes to 175 grams/10 minutes,and(2) from 60 to 95 weight percent of at least one filler, wherein weight percent of (1) and (2) is based on the weight of the filled polyolefin (A) and (B) from 3 to 10 parts by weight of at least one functionalized polyethylene having a melt index (I2) equal to or greater than 500,wherein the parts by weight of (A) and (B) is based on the total weight of the polyolefin composition.