Elastomer composition

Patent metadata

Field	Value
Publication number	US-11987706-B2
Application number	US-201917259638-A
Country	US
Kind code	B2
Filing date	May 29, 2019
Priority date	Jul 30, 2018
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

An elastomer composition including (a) an elastomer blend component; (b) at least one first odor-reducing component; and (c) at least one second odor-reducing component; the elastomer component (a) including a hydrogenated block copolymer, a propylene polymer, a maleic anhydride grafted polymer, a mineral oil, and a filler, and/or a nucleating agent. The elastomer composition can be particularly suitable for fabricating injection molded non-carpet vehicle flooring with a reduced amount of undesirable odor.

First claim

What is claimed is:

1. An elastomer composition comprising:
(a) an elastomer blend component comprising a mixture of:
(ai) from 10 weight percent to 30 weight percent of a hydrogenated block copolymer produced by hydrogenating a block copolymer comprising at least one polymer block composed of a vinyl aromatic compound as a principal component and at least one polymer block composed of a conjugated diene compound as a principal component, said hydrogenated copolymer having a number average molecular weight ≤200,000 Daltons;
(aii) from 5 weight percent to 30 weight percent of a propylene homopolymer and/or a propylene copolymer comprising propylene;
(aiii) from 20 weight percent to 40 weight percent of a mineral oil;
(aiv) from 0.5 weight percent to 10 weight percent of a maleic anhydride grafted polymer; and
(av) from 10 weight percent to 45 weight percent of a non-surface treated filler;

(b) at least one first odor-reducing component; and
(c) at least one second odor-reducing component.

2. The composition of claim 1 , wherein the first odor-reducing component (b) is selected from the group consisting of plant oils, plant-based diluents, and mixtures thereof.

3. The composition of claim 1 , wherein the second odor-reducing component (c) is at least one silicone.

4. The composition of claim 3 , wherein the at least one silicone is a tri-methyl terminated polydimethylsiloxane.

5. The composition of claim 1 , wherein the concentration of the first odor-reducing component is from 0.01 weight percent to 2.0 weight percent; and wherein the concentration of the second odor-reducing component is from 0.01 weight percent to 2.0 weight percent, based on the total weight of the elastomer composition.

6. The composition of claim 1 , wherein the hydrogenated block copolymer (ai) is styrene-ethylene/butylene-styrene.

7. The composition of claim 1 , wherein the propylene homopolymer and/or a propylene copolymer comprising propylene is a propylene homopolymer with a melt flow rate equal to or less than 25 grams/10 minutes.

8. The composition of claim 1 , wherein the maleic anhydride grafted polymer (aiv) is a maleic anhydride grafted SEBS block copolymer, a maleic anhydride grafted polyethylene, or a maleic anhydride grafted polypropylene.

9. The composition of claim 1 , wherein the maleic anhydride grafted polymer (aiv) is a maleic anhydride styrene-ethylene/butylene-styrene block copolymer, a maleic anhydride grafted polypropylene, or a maleic anhydride grafted high density polyethylene.

10. The composition of claim 1 , wherein the filler (av) is a non-surface treated, colorless calcium carbonate.

11. A process for making a molded product comprising the steps of:
(A) forming an elastomer composition comprising:
(a) an elastomer component including:
(ai) from 10 weight percent to 30 weight percent of a hydrogenated block copolymer produced by hydrogenating a block copolymer comprising at least one polymer block composed of a vinyl aromatic compound as a principal component and at least one polymer block composed of a conjugated diene compound as a principal component, said hydrogenated copolymer having a number average molecular weight less than or equal to 200,000 Daltons;
(aii) from 5 weight percent to 30 weight percent of a propylene homopolymer and/or a propylene copolymer comprising propylene as a principal component;
(aiii) from 20 weight percent to 40 weight percent of a mineral oil;
(aiv) from 0.5 weight percent to 10 weight percent of a maleic anhydride grafted polymer; and
(av) from 10 weight percent to 45 weight percent of a non-surface treated filler;

(b) from 0.01 weight percent to 2.0 weight percent of at least one first odor-reducing component; and
(c) from 0.01 weight percent to 2.0 weight percent of at least one second odor-reducing component; and

(B) injection molding the elastomer composition into a shaped molded product.

12. A shaped molded product article made by the process of claim 11 .

13. The article of claim 12 , wherein the article is a non-carpeted flooring.

14. A process for reducing the odor of an injection molded non-carpet flooring article comprising (I) adding at least a first oder-reducing compound and at least a second oder-reducing compound to an elastomer composition adapted for injection molding, the elastomer blend component comprising a mixture of:
(ai) from 10 weight percent to 30 weight percent of a hydrogenated block copolymer produced by hydrogenating a block copolymer comprising at least one polymer block composed of a vinyl aromatic compound as a principal component and at least one polymer block composed of a conjugated diene compound as a principal component, said hydrogenated copolymer having a number average molecular weight≤200,000 Daltons;
(aii) from 5 weight percent to 30 weight percent of a propylene homopolymer and/or a propylene copolymer comprising propylene;
(aiii) from 20 weight percent to 40 weight percent of a mineral oil;
(aiv) from 0.5 weight percent to 10 weight percent of a maleic anhydride grafted polymer; and
(av) from 10 weight percent to 45 weight percent of a non-surface treated filler; and
(II) injection molding the elastomer composition into a shaped molded product.

Assignees

• Dow Global Technologies Llc
• Dow Silicones Corp

Inventors

• Seliskar James T
• Hays Ted

Classifications

• C08L91/00 Primary

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title

• B60N3/04

  of floor mats {or carpets} · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• B60N3/042

  of carpets (B60N3/046, B60N3/048 take precedence) · CPC title