Polyolefin composite composition for automotive airduct

Patent metadata

Field	Value
Publication number	US-9809691-B2
Application number	US-201615284782-A
Country	US
Kind code	B2
Filing date	Oct 4, 2016
Priority date	Mar 17, 2016
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A polyolefin composite composition is used in an automotive air duct. The polyolefin composite composition is useful as an automotive air duct component material due to excellent mechanical property, heat resistance, and foaming property as a composition in which a polyethylene resin and a long chain branched polypropylene resin having low crystallization of 45% or less are included as a base resin.

First claim

What is claimed is:

1. A polyolefin composite composition, comprising:
a polyethylene resin of 65 to 94.5 wt, %;
a long chain branched polypropylene resin of 5 to 30 wt. % with crystallization of 20 to 45%; and
an inorganic filler of 0.5 to 5 wt. %, based on the overall weight of the polyolefin composite composition;
wherein the long chain branched polypropylene resin has branched chains of 4 to 20/1,000 C in a linear polypropylene.

2. The polyolefin composite composition of claim 1 , wherein the polyethylene resin is at least one selected from a group consisting of high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and ethylene vinyl acetate (EVA).

3. The polyolefin composite composition of claim 1 , wherein the polyethylene resin has a melt index of 0.5 to 10 g/10 min (230° C. and 2.16 Kgf).

4. The polyolefin composite composition of claim 1 , wherein the inorganic filler has an average particle size of 1 to 4 μm and is at least one selected from a group consisting of talc, calcium carbonate, calcium sulfate, magnesium oxide, calcium stearate, wollastonite, mica, silica, calcium silicate, clay, whisker, and carbon black.

5. The polyolefin composite composition of claim 1 , further comprising:
at least one additive selected from a group consisting of antioxidants, UV stabilizers, flame retardants, colorants, plasticizers, thermal stabilizers, slip agents, and antistatic agents.

6. A polyolefin composite prepared by mixing and melt-extruding the composition of claim 1 .

7. A molded article for an automotive air duct prepared through foam-molding by including a foaming agent in the polyolefin composite of claim 6 .

Assignees

• Hyundai Motor Co Ltd
• Lotte Chemical Corp
• Kia Motors Corp

Inventors

• Yi Seul
• An Boo Youn
• Kim Dae Sik
• Jang Kyeong Hoon
• Han In Soo
• Park You Jin
• Nam Byung Kook
• Lee Hyeung Shin
• Kim Hyun Jin

Classifications

• C08J9/0061 Primary

  characterized by the use of several polymeric components · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title

• B60H1/00564

  of air ducts · CPC title

• C08J9/0066

  Use of inorganic compounding ingredients · CPC title

• C08J2323/06

  Polyethene · CPC title