Back to results
US 6,204,330 B1Granted
Polymer mixture for slush molding
AssigneeMontell North Americia Inc.
InventorsVittorio Braga, Carlo Mulas, Ugo Zuccelli
Life of this patent
Estimating the term…
Abstract
A mixture of elastomeric thermoplastic compositions which includes, on a weight percentage basis, (A) from 40 to 90% of a heterophasic polyolefin composition having a melt flow rate measured according to ASTM-D 1238, condition L, ranging from 20 to 100 g/10 min; and (B) from 10 to 60% of a heterophasic polyolefin composition that is partially dynamically crosslinked. The powders of this mixture are used in slush molding process for the production of laminated products.
Claims10
A mixture of elastomeric thermoplastic compositions comprising (weight percentage):
- A) from 40 to 90% of a heterophasic polyolefin composition (A) having a melt flow rate (measured according to ASTM-D 1238, condition L) ranging from 20 to 100 g/10 min;
- and
- B) from 10 to 60% of a partially dynamically cross-linked heterophasic polyolefin composition (B);
- where composition (A) comprises the following polymer fractions (parts and percentage by weight):
- a) 10-40 parts of an isotactic propylene homopolymer having an isotactic index greater than 80, or a propylene random copolymer with ethylene and/or a C4-C10 α-olefin of formula CH2═CR where R is a C2-C8 alkyl radical, with an isotactic index in boiling heptane greater than 80;
- said fraction having an intrinsic viscosity ranging from 0.8 to 1.3 dL/g;
- b) 0-20 parts of a copolymer fraction containing ethylene, insoluble in xylene at ambient temperature;
- and
- c) 40-95 parts of a copolymer fraction of ethylene with propylene and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical, and optionally a small quantity of diene;
- said fraction, soluble in xylene at ambient temperature, contains ethylene in quantities less than or equal to 35%;
- and composition (B) comprises the following polymer fractions (parts and percentage by weight):
- i) 5-50 parts of an isotactic propylene homopolymer having an isotactic index greater than 80, or a propylene random copolymer with ethylene and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical;
- said copolymer containing more than 85%, of propylene, and having an isotactic index in boiling heptane greater than 80;
- said fraction having an intrinsic viscosity ranging from 0.15 to 0.6 dL/g;
- ii) 50-95 parts, of an elastomeric polymer fraction partially cross-linked and partially soluble in xylene at ambient temperature, containing ethylene, propylene, and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical, and with optionally a small quantity of diene;
- said composition (B) comprising from 20 to 92% of a fraction (I) soluble in xylene at ambient temperature, and containing ethylene, propylene, and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical, and optionally a small quantity of diene, where the ethylene is present in fraction (I) in quantities less than or equal to 35%.
13 more elements
A process comprising slush molding a mixture of elastomeric thermoplastic compositions comprising (weight percentage):
- (A) from 40 to 90% of a heterophasic polyolefin composition (A) having a melt flow rate measured according to ASTM-D 1238, condition L, ranging from 20 to 100 g/10 min;
- and
- (B) from 10 to 60% of a partially dynamically crosslinked heterophasic polyolefin composition (B);
- where composition (A) comprises the following Polymer fractions (parts and percentages by weight):
- a) 10-40 parts of an isotactic propylene homopolymer having an isotactic index greater than 80, or a propylene random copolymer with ethylene and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical, with an isotactic index in boiling heptane greater than 80;
- said fraction having an intrinsic viscosity ranging from 0.8 to 1.3 dL/g;
- b) 0-20 parts of a copolymer fraction containing ethylene, insoluble in xylene at ambient temperature;
- c) 40-95 parts of a copolymer of ethylene with propylene and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical, and optionally a small quantity of diene;
- said fraction, soluble in xylene at ambient temperature, contains ethylene in quantities less than or equal to 35%;
- and composition (B) comprises the following polymer fractions (parts and percentages by weight):
- i) 5-50 parts of an isotactic propylene homopolymer having an isotactic index greater than 80, or a propylene random copolymer with ethylene and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical;
- said copolymer containing more than 85% of propylene, and having an isotactic index in boiling heptane greater than 80;
- said fraction having an intrinsic viscosity ranging from 0.15 to 0.60 dL/g;
- ii) 50-95 parts, of an elastomeric polymer fraction partially crosslinked and partially soluble in xylene at ambient temperature, containing ethylene, propylene and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical, and optionally with a small quantity of a diene;
- said composition (B) comprising from 20 to 90% of a fraction (I) soluble in xylene at ambient temperature and containing ethylene, propylene and/or a C4-C10 α-olefin of formula CH2═CHR, where R is a C2-C8 alkyl radical, and optionally with a small quantity of a diene;
- where the ethylene is present in fraction (I) in quantities less than or equal to 35%.
13 more elements
Dependencies are inferred from the claim text.