Thermoplastic molding composition having improved dimensional stability and low gloss
AssigneeBayer Aktiengesellschaft
InventorsChuan-Ju Chen, Marc E. Gage
Life of this patent
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Abstract
A thermoplastic molding composition which features improved dimensional stability and low gloss is disclosed. The composition which contains (A) a first grafted rubber having a weight average particle size of 0.05 to 0.30 microns, (B) a second grafted rubber having a weight average particle size of 0.31 to 1.00 microns, (C) vinyl chloride (co) polymer, and, optionally, (D) styrene copolymer, is especially suitable for extruding profiles. In a preferred embodiment, at least one of the grafted rubbers is characterized in that its substrate features a core-shell structure, wherein the core contain at least one crosslinked vinylaromatic polymer, and the shell is elastomeric.
Claims10
A thermoplastic molding composition consisting essentially of
- (A) a first grafted rubber having a weight average particle size of 0.05 to 0.30 microns,
- (B) a second grafted rubber having a weight average particle size of 0.31 to 1.00 microns,
- (C) (co)polymer of vinyl chloride, and, optionally,
- (D) styrene copolymer,
- wherein total rubber content is 15 to 25 percent relative to the total weight of (A), (B) and (C) and (D) and wherein said grafted rubber, both occurrences, contains a grafted phase and a substrate, and wherein said grafted phase contains a copolymer of at least one monomer selected from a first group consisting of styrene, α-methyl styrene, ring-halogenated styrene and ring-alkylated styrene and at least one monomer selected from a second group consisting of (meth)acrylonitrile, wherein weight ratio between said monomer of said first group and said monomer of said second group is about 80:20 to about 65:35 and wherein the substrate comprises the crosslinked polymerization product of at least one member selected from the group consisting of C2-8-alkyl acrylate, vinyl acetate, hydrogenated diene and diene, said styrene copolymer (D) containing a copolymer of at least one monomer selected from a first group consisting of styrene, α-methyl styrene, ring-halogenated styrene and ring-alkylated styrene and at least one monomer selected from a second group consisting of (meth)acrylonitrile and methyl methacrylate where weight ratio between said monomer of said first group to said monomer of said second group ranges from 80:20 to about 65:35.
A thermoplastic molding composition consisting essentially of
- (A) a first grafted rubber having a weight average particle size of 0.05 to 0.30 microns,
- (B) a second grafted rubber having a weight average particle size of 0.31 to 1.00 microns,
- (C) (co)polymer of vinyl chloride, and, optionally,
- (D) styrene copolymer,
- wherein total rubber content is 15 to 25 percent relative to the total weight of (A), (B) and (C) and (D) and wherein said grafted rubber, both occurrences, contains a grafted phase and a substrate, and wherein said grafted phase contains a copolymer of at least one monomer selected from a first group consisting of styrene, α-methyl styrene, ring-halogenated styrene and ring-alkylated styrene and at least one monomer selected from a second group consisting of (meth)acrylonitrile, wherein weight ratio between said monomer of said first group and said monomer of said second group is about 80:20 to about 65:35 and wherein the substrate comprises the crosslinked polymerization product of at least one member selected from the group consisting of C2-8-alkyl acrylate, vinyl acetate, hydrogenated diene and diene, said styrene copolymer (D) containing a copolymer of at least one monomer selected from a first group consisting of styrene, α-methyl styrene, ring-halogenated styrene and ring-alkylated styrene and at least one monomer selected from a second group consisting of (meth)acrylonitrile and methyl methacrylate where weight ratio between said monomer of said first group to said monomer of said second group ranges from 80:20 to about 65:35 with the proviso that the substrate of at least one of said (A) and (B) comprise a core/shell structure.
Dependencies are inferred from the claim text.