Polypropylene mineral compound with reduced volatiles
View Patent ↗Use of an inosilicate in a polymer composition to accomplish a headspace emission of all volatiles together of said polymer composition of equal or below 120 μgC/g.
1. A polymer composition comprising:
inosilicate, polypropylene, and phenolic antioxidant(s), wherein headspace emission measured according to VDA 277
(a) of all volatiles together of said polymer composition is equal to or below 120 μgC/g
and/or
(b) of 2-methyl-1-propene of said polymer composition is not more than 70 μgC/g.
2. The polymer composition according to claim 1 , wherein the inosilicate is a single chain inosilicate.
3. The polymer composition according to claim 1 , wherein the inosilicate is from the pyroxenoid group.
4. The polymer composition according to claim 1 , wherein the inosilicate is wollastonite (Ca 3 [Si 3 O 9 ]).
5. The polymer composition according to claim 1 , wherein the polymer composition comprises additionally (a) phosphorous antioxidant(s).
6. The polymer composition according to claim 1 , wherein the polymer composition comprises:
(a) at least 50 wt. % polypropylene
(b) 1,000 to 550,000 ppm inosilicate,
(c) 100 to 5,000 ppm of phenolic antioxidants, and
(d) optionally 100 to 5,000 ppm of phosphorous antioxidants based on the polymer composition.
7. The polymer composition according to claim 1 , wherein the polymer composition does not comprise talc.
8. The polymer composition according to claim 1 , wherein the polypropylene is a heterophasic propylene copolymer comprising a polypropylene matrix and an amorphous elastomer.
9. The polymer composition according to claim 1 , wherein the phenolic antioxidant(s) is/are (a) sterically hindered phenolic antioxidant(s).
10. The polymer composition according to claim 1 , wherein the phenolic antioxidant(s) comprise(s) at least one residue of formula (II):
wherein R 4 is (CH 3 ) 3 C—, CH 3 —, or H, and
A 2 constitutes the remaining part of the phenolic antioxidant(s).
11. The polymer composition according to claim 1 , wherein the polymer composition comprises additionally:
(a) polyethers having a weight average molecular weight (Mw) of more than 300 g/mol,
and/or
(b) carbonyl compounds selected from the group consisting of carboxylic acid, carboxylic acid amide and carboxylic acid ester.
12. The polymer composition according to claim 6 , wherein the inosilicate is a single chain inosilicate.
13. The polymer composition according to claim 6 , wherein the inosilicate is from the pyroxenoid group.
14. The polymer composition according to claim 6 , wherein the inosilicate is wollastonite (Ca 3 [Si 3 O 9 ]).
15. The polymer composition according to claim 6 , wherein the polymer composition does not comprise talc.
16. The polymer composition according to claim 6 , wherein the polypropylene is a heterophasic propylene copolymer comprising a polypropylene matrix and an amorphous elastomer.
17. The polymer composition according to claim 6 , wherein the phenolic antioxidant(s) is/are (a) sterically hindered phenolic antioxidant(s).
18. The polymer composition according to claim 6 , wherein the phenolic antioxidant(s) comprise(s) at least one residue of formula (II):
wherein R 4 is (CH 3 ) 3 C—, CH 3 —, or H, and
A 2 constitutes the remaining part of the phenolic antioxidant(s).
19. The polymer composition according to claim 6 , further comprising:
(a) polyethers having a weight average molecular weight (Mw) of more than 300 g/mol,
and/or
(b) carbonyl compounds selected from the group consisting of carboxylic acid, carboxylic acid amide and carboxylic acid ester.