Polyolefin compositions having low hardness and low gloss
AssigneeBasell Poliolefine Italia S.r.l.
InventorsPaolo Goberti, Giampaolo Pellegatti, Letizia Baraldi
Life of this patent
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Abstract
A polyolefin composition comprising, in percent by weight: A) 20-35% of a propylene homopolymer or copolymer with up to 8% of comonomer(s); B) 65-80% of a copolymer of ethylene and (i) propylene or (ii) CH2═CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with minor amounts of a diene, containing from 40 to less than 54% of ethylene; wherein the weight ratio B/XS of the content B of copolymer component (B) to the fraction XS soluble in xylene at room temperature, both referred to the total weight of (A)+(B), is of 1.25 or less.
Claims11
A polyolefin composition comprising, in percent by weight:
- A) 20-35% of a propylene homopolymer or a copolymer of propylene with at least one comonomer selected from ethylene and CH2═CHR alpha-olefins where R is a 2-8 carbon alkyl, the copolymer comprising up to 8% of the comonomer, or a combination of the propylene homopolymer and the copolymer of propylene;
- B) 65-80% of a copolymer of ethylene and (i) propylene or (ii) CH2═CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with minor amounts of a diene, comprising from 40% to less than 54% of ethylene;
- wherein the weight ratio B/XS of the content B of copolymer component (B) to the fraction XS soluble in xylene at room temperature, both referred to the total weight of (A)+(B), is 1.25 or less, and the intrinsic viscosity [η] of the XS fraction is less than 3 dl/g.
A polymerization process for preparing a polyolefin composition comprising, in percent by weight:
- A) 20-35% of a propylene homopolymer or a copolymer of propylene with at least one comonomer selected from ethylene and CH2═CHR alpha-olefins where R is a 2-8 carbon alkyl, the copolymer comprising up to 8% of the comonomer, or a combination of the propylene homopolymer and the copolymer of propylene;
- B) 65-80% of a copolymer of ethylene and (i) propylene or (ii) CH2═CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with minor amounts of a diene, comprising from 40% to less than 54% of ethylene;
- wherein the weight ratio B/XS of the content B of copolymer component (B) to the fraction XS soluble in xylene at room temperature, both referred to the total weight of (A)+(B), is 1.25 or less, and the intrinsic viscosity [η] of the XS fraction is less than 3 dl/g;
- the process comprising at least two sequential stages, wherein components (A) and (B) are prepared in separate subsequent stages, operating in each stage, except the first stage, in presence of the polymer formed and catalyst used in the preceding stage.
Manufactured articles, comprising a polyolefin composition comprising, in percent by weight:
- A) 20-35% of a propylene homopolymer or a copolymer of propylene with at least one comonomer selected from ethylene and CH2═CHR alpha-olefins where R is a 2-8 carbon alkyl, the copolymer comprising up to 8% of the comonomer, or a combination of the propylene homopolymer and the copolymer of propylene;
- B) 65-80% of a copolymer of ethylene and (i) propylene or (ii) CH2═CHR alpha-olefins, where R is a 2-8 carbon alkyl radical, or (iii) a combination thereof, optionally with minor amounts of a diene, comprising from 40% to less than 54% of ethylene;
- wherein the weight ratio B/XS of the content B of copolymer component (B) to the fraction XS soluble in xylene at room temperature, both referred to the total weight of (A)+(B), is 1.25 or less, the intrinsic viscosity [η] of the XS fraction is less than 3 dl/g;
- the manufactured articles being prepared by extrusion or injection molding, and the manufactured articles being selected from sheets, films, and car parts.
Dependencies are inferred from the claim text.