Abstract Substantially crystalline block polymers comprising a homopolymer block of an alpha-olefin having 2-8 carbon atoms and attached thereto a copolymer block of at least 2 alpha-olefins containing 2-8 carbon atoms, one of which may be the same or different from the alpha-olefin from which the homo-polymer block is prepared. Such block polymers are prepared in the presence of a stereospecific catalyst system by contacting the aforesaid alpha-olefin with said catalyst system to form the solid, substantially crystalline homo-polymer block, and then contacting the same catalyst system with the aforesaid mixture of said alpha-olfins. In an embodiment between about 55 and 95 percent of the polymerization time is expended in preparing the homo-polymer block. When preparing the copolymer block, one uses at least as much of the least reactive alpha-olefin, or more of the same, as one uses of the more reactive monomers.
Inventors
👤 James L Jezl
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 19:45
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
A POLYMERIC PRODUCT COMPRISING POLYPROPYLENE AND COPOLYMER CONSISTING ESSENTIALLY OF A BLOCK OF PROPYLENE HOMOPOLYMER TERMINALLY BONDED TO A BLOCK OF AN INTEROLYMER OF PROPYLENE AND ETHYLENE HAVING THE FORMULA:
Claim 2
Dependent Claim
30 words
A POLYMERIC PRODUCT COMPRISING POLYPROPYLENE AND COPOLYMER CONSISTING ESSENTIALLY OF A BLOCK OF PROPYLENE HOMOPOLYMER TERMINALLY BONDED TO A BLOCK OF AN INTEROLYMER OF PROPYLENE AND ETHYLENE HAVING THE FORMULA:
Claim 3
Dependent Claim
74 words
As a new composition of matter, a modified polypropylene product comprising highly isotactic polypropylene polymer chains uninterrupted by ethylene and having ethylene-propylene copolymer attached to one end of at least a portion of the polypropylene chains, the total amount of ethylene units in said product being in the range from 0.2 to 20 percent by weight and the proportion of ethylene units in said ethylene-propylene copolymer being between 10 and 90 percent by weight.
Claim 4
Dependent Claim
74 words
As a new composition of matter, a modified polypropylene product comprising highly isotactic polypropylene polymer chains uninterrupted by ethylene and having ethylene-propylene copolymer attached to one end of at least a portion of the polypropylene chains, the total amount of ethylene units in said product being in the range from 0.2 to 20 percent by weight and the proportion of ethylene units in said ethylene-propylene copolymer being between 10 and 90 percent by weight.
Claim 5
Dependent Claim
31 words
The polymeric product according to claim 1 having an Izod impact strength of at least 3.5 ft. lbs./in. and a tensile yield strength of at least 3,000 psi at 1 in./min.