Soft touch compositions and articles thereof

Patent metadata

Field	Value
Publication number	US-2016208084-A1
Application number	US-201414915452-A
Country	US
Kind code	A1
Filing date	Aug 27, 2014
Priority date	Aug 28, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A soft touch composition comprises, based on the total weight of the composition, 50 to 88 wt % of a polymer comprising, based on the total weight of the polymer, 44 to 52 wt % of a polypropylene homopolymer, 3 to 30 wt % of an ethylene-propylene copolymer, and 22 to 52 wt % of an ethylene-C 4 to C 8 alpha olefin copolymer, and 10 to 40 wt % of glass fibers.

First claim

We claim:

1 . A soft touch composition comprising, based on the total weight of the composition,
10 to 40 wt % of glass fibers; and 50 to 88 wt % of a polymer comprising, based on the total weight of the polymer,
44 to 52 wt % of a polypropylene homopolymer,
3 to 30 wt % of an ethylene-propylene copolymer, and
22 to 52 wt % of an ethylene-C 4 to C 8 alpha olefin copolymer.

2 . The composition of claim 1 , wherein the polypropylene homopolymer has a melt flow index of 5 to 150 g/10 min measured at 230° C. under 2.16 kg force according to ISO 1133.

3 . The composition of claim 1 , wherein a cold xylene soluble fraction of the ethylene-propylene copolymer has an intrinsic viscosity of 2 to 8 dl/g measured in decalin at 135° C.

4 . The composition of claim 3 , wherein a cold xylene soluble fraction of the ethylene-propylene copolymer has an intrinsic viscosity of 3 to 8 dl/g measured in decalin at 135° C.

5 . The composition of claim 1 , wherein the ethylene-C 4 to C 8 alpha olefin copolymer is polymerized from ethylene and at least one of 1-butene, 1-hexene, and 1-octene.

6 . The composition of claim 1 , wherein the ethylene-C 4 to C 8 alpha olefin copolymer has a density of 850 to 880 kg/m 3 and a melt flow index of 0.5 to 35 g/10 min measured at 190° C. under 2.16 kg force according to ISO 1133.

7 . The composition of claim 1 , wherein the glass fibers have a filament diameter of 10 to 20 micrometers.

8 . The composition of claim 1 , further comprising a modified polypropylene, wherein the modified polypropylene is a polypropylene grafted with a carboxylic acid or salts thereof, an anhydride, an ester, or a combination comprising at least one of the foregoing.

9 . The composition of claim 8 , wherein the modified polypropylene is a homopolypropylene grafted with maleic anhydride.

10 . The composition of claim 9 , wherein a functional group derived from maleic anhydride is present in an amount of greater than or equal to 0.5 wt %, based on the total weight of the modified polypropylene.

11 . The composition of claim 8 , wherein the modified polypropylene is present in an amount of 0.1 to 4 wt %, based on the total weight of the composition.

12 . The composition of claim 1 , further comprising a silicone particle having the formula (I)
R x SiO 2-(x/2)   (I)

wherein x is a positive number greater than or equal to 1, and each R is independently an aliphatic hydrocarbon group, an aromatic hydrocarbon, or an unsaturated group.

13 . The composition of claim 12 , wherein the silicone particle comprises methylsilsequioxane.

14 . The composition of claim 12 , wherein the silicone particle has a mean particle diameter of 1.8 to 10.5 micrometers.

15 . The composition of claim 12 , wherein the silicone particle is present in an amount of 1 to 5 wt %, based on the total weight of the composition.

16 . The composition of claim 1 , further comprising 0.1 to 5 wt % of a colorant.

17 . The composition of claim 1 , further comprising a polysiloxane, wherein the polysiloxane comprises an ultra high molecular weight polysiloxane with a kinematic viscosity of greater than 10×10 6 centistokes as determined in accordance with ASTM D445.

18 . The composition of claim 17 , wherein the polysiloxane is present in an amount of 0.2 to 10 wt %.

19 . The composition of claim 1 , wherein the composition further comprises 0.1 to 2 wt % of a thermal stabilizer, a UV stabilizer, a visible light stabilizer, an antioxidant, or a combination comprising one or more of the foregoing.

20 . An article made from the composition of claim 1 .

Assignees

• Sabic Global Technologies Bv

Inventors

• Hrachova Jana
• Essers Franciscus Elisabeth Jacobus

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2207/02

  Heterophasic composition · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L23/12 Primary

  Polypropene · CPC title