Elastoplastic Poyolefin Compositions Having Low Gloss

Abstract

Elastoplastic polyolefin composition comprising, in percent by weight: A) 10-50% of a copolymer of propylene with one or more comonomer(s) selected from ethylene and CH 2 ═CHR alpha-olefins where R is a 2-8 carbon alkyl, which copolymer contains from 1 to 8% of comonomer(s); B) 50-90% of a copolymer of ethylene and (i) propylene or (ii) CH 2 ═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 57 to 80% 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 1.5 or less, and the intrinsic viscosity [η] of the said XS fraction is of 3 dl/g or more.

1 . An elastoplastic polyolefin composition comprising, in percent by weight:
 (A) 10-50% of a copolymer of propylene with at least one comonomer selected from ethylene and CH 2 ═CHR alpha-olefins where R is a 2-8 carbon alkyl, which copolymer contains from 1 to 8% of the at least one comonomer;   (B) 50-90% of a copolymer of ethylene and (i) propylene or (ii) CH 2 ═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 57 to 80% of ethylene;
 a fraction XS soluble in xylene at room temperature comprising an intrinsic viscosity [η] of at least 3 dl/g; and 
 a weight ratio B/XS of at most 1.5, where B is the content of copolymer component (B), and B and XS both refer to the total weight of (A)+(B). 
   
   
   
       2 . The elastoplastic polyolefin composition of  claim 1 , further comprising an MFR value of from 0.01 to 10 g/10 min. 
   
   
       3 . The elastoplastic polyolefin composition of  claim 1 , further comprising Flexural Modulus values of at most 200 MPa. 
   
   
       4 . The elastoplastic polyolefin composition of  claim 1 , further comprising Shore D values of at most 35. 
   
   
       5 . A process for preparing an elastoplastic polyolefin composition comprising:
 (A) 10-50% of a copolymer of propylene with at least one comonomer selected from ethylene and CH 2 ═CHR alpha-olefins where R is a 2-8 carbon alkyl, which copolymer contains from 1 to 8% of the at least one comonomer;   (B) 50-90% of a copolymer of ethylene and (i) propylene or (ii) CH 2 ═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 57 to 80% of ethylene;
 a fraction XS soluble in xylene at room temperature comprising an intrinsic viscosity [η] of at least 3 dl/g; and 
 a weight ratio B/XS of at most 1.5, where B is the content of copolymer component (B), and B and XS both refer to the total weight of (A)+(B), the process comprising polymerizing in 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 the presence of the polymer formed and the catalyst used in the preceding stage. 
   
   
   
       6 . A manufactured article comprising an elastoplastic polyolefin composition comprising:
 (A) 10-50% of a copolymer of propylene with at least one comonomer selected from ethylene and CH 2 ═CHR alpha-olefins where R is a 2-8 carbon alkyl, which copolymer contains from 1 to 8% of the at least one comonomer;   (B) 50-90% of a copolymer of ethylene and (i) propylene or (ii) CH 2 ═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 57 to 80% of ethylene;
 a fraction XS soluble in xylene at room temperature comprising an intrinsic viscosity [η] of at least 3 dl/g; and 
 a weight ratio B/XS of at most 1.5, where B is the content of copolymer component (B), and B and XS both refer to the total weight of (A)+(B). 
   
   
   
       7 . The manufactured article of  claim 6  selected from sheets, automotive skin layers, blow moulded articles or films.