Propylene polymer and copolymers grafted with vinylpolybutadiene and their preparation process

• US 5,574,111 A
• Filed: 06/06/1995
• Issued: 11/12/1996
• Est. Priority Date: 11/12/1991
• Status: Expired due to Fees

• Current Assignee: Centro Sviluppo Settori Impiego S.r.l.
• Original Assignee: Centro Sviluppo Settori Impiego S.r.l.
• Inventors: Mascia, Francesco, Addeo, Antonio, Brichta, Corrado, Di Somma, Amodio, Torregiani, Gabriele
• Primary Examiner(s): JAGANNATHAN, VASUDEVAN SALEM
• Application Number:
  US08/470,625
• Time in Patent Office: 525 Days
• Field of Search: 525/208, 525/221, 525/232, 525/286, 525/298, 525/301, 525/313, 525/914, 525/240
• US Class Current: 525/313
• CPC Class Codes: C08F 255/02 on to polymers of olefins having two or three carbon atoms
• CPC Class Codes: C08F 299/00 Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 23/142 at least partially crystalline copolymers of propene with other olefins
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: Y10S 525/914 Polymer from conjugated diene hydrocarbon or halohydrocarbons having more than 50 per cent 1,2-microstructure

Abstract

Crystalline propylene (co)polymers modified by grafting with a vinylpolybutadiene having 1,2-structure content of at least 10%.

Said (co)polymers are reacted with a liquid vinylpolybutadiene in the presence of a non-peroxidic radical initiator at a temperature in the range 200° to 350° C., the liquid vinylpolybutadiene having a 1.2-structure content of at least 10% and being generally used in amounts within the range 0,5 to 20% by weight.

Claims

1. A process for preparing a propylene (co)polymer grafted with vinylpolybutadiene having at least 10% of 1,2 units, said process comprising submitting said (co)polymer to a thermal treatment at a temperature of from 200°

C. to 350°

C. in the presence of;

(a) vinyl polybutadiene having at least 10% of units with 1,2 structure;

(b) an anti-oxidant; and

(c) a non-peroxidic free-radical initiator.

2. The process of claim 1, wherein the propylene (co)polymers subjected to thermal treatment have an isotacticity index higher than 80%.

3. The process of claim 1, wherein said process is carried out during extrusion of components (a), (b) and (c).

4. The process of claim 1, wherein said process is carried out during injection molding of components (a), (b) and (c).