Thermoplastic vulcanisate blend

• US 7,989,548 B2
• Filed: 07/07/2009
• Issued: 08/02/2011
• Est. Priority Date: 02/07/2005
• Status: Expired due to Fees

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Leboeuf, Philippe, Descombes, Vincent, Philippoz, Jean-Michel, Cavalli, Serge, Renaud, Michel C.
• Primary Examiner(s): WOODWARD, ANA LUCRECIA
• Application Number:
  US12/498,587
• Publication Number:
  US 20100273945A1
• Time in Patent Office: 756 Days
• Field of Search: 525/167, 525/173, 525/174, 525/176, 525/177, 525/179
• US Class Current: 525/177
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 23/0869 Acids or derivatives thereof
• CPC Class Codes: C08L 23/0876 Neutralised polymers, i.e. ionomers
• CPC Class Codes: C08L 23/0884 Epoxide containing esters
• CPC Class Codes: C08L 2312/02 with dienes
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 33/04 Homopolymers or copolymers of esters C08L43/04 takes precedence
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 67/025 containing polyether sequences

Abstract

The invention relates to a new polymer blend comprising:

• • 20 to 70 wt % of a mixture (A) of two or more polyalkylene phthalates;
  • 2 to 60 wt % of a cross-linked acrylate rubber;
  • 0.5 to 20 wt % of an ionomer; and
  • 1 to 30 wt % of a terpolymer of ethylene, butylacrylate (BA) and glycidylmethacrylate (GMA);
  • wherein the weight percentages are based on the sum of the above ingredients.

The polymer blend of the invention is particularly suitable for blow-moulding, to make parts for high-temperature, high-oil-exposure uses.

Claims

1. A process for making a polymer blend suitable for blow moulding, comprising compounding in a melt extruder at a temperature sufficient to melt and mix all components:

thermoplastic vulcanisate (X) component comprising;

(X1) from 15 to 60 weight percent of polyalkylene terephthalate polyester polymer or copolymer continuous phase, and

(X2) from 40 to 85 weight percent of rubber disperse phase comprising poly(meth)acrylate or a polymer comprised of ethylene and methyl acrylate, said rubber being dynamically cross-linked with an organic peroxide free radical initiator and an organic diene co-agent;

together with thermoplastic polyester component (Y) comprising;

(Y1) from about 5 to about 25 weight percent of a copolyether —

ester block copolymer elastomer;

(Y2) from about 40 to about 65 weight percent of poly(butylene terephthalate)

(Y3) from about 5 to about 20 weight percent of an ionomer, said ionomer comprising copolymers of ethylene and methacrylic acid, the ionomer having acid moieties from about 10 to 100 mol percent neutralized; and

(Y4) from about 5 to about 30 weight percent of terpolymer of ethylene, butylacrylate and glycidylmethacrylate;

the total of (Y1), (Y2), (Y3) and (Y4) being 100% by weight;

the total of (Y1) and (Y2) not exceeding 70% by weight.

2. A batch process for making a polymer blend suitable for blow moulding, comprising the following steps:

(1) mixing in a batch melt blender;

20 to 70 weight percent of a mixture (A) comprising;

(A1) block copolyester elastomer, and

(A2) poly(butylene terephthalate);

2 to 60 weight percent of rubber comprising poly(meth)acrylate or polymer comprised of ethylene and methyl acrylate, said rubber being capable of being dynamically cross-linked;

0.5 to 20 weight percent of ionomer, comprising copolymers of ethylene and methacrylic acid, the ionomer having acid moieties from about 10 to 100 mol percent neutralized; and

1 to 30 weight percent of terpolymer of ethylene, butylacrylate and glycidylmethacrylate;

the mixing taking place at a temperature sufficient to melt all the components to make a homogeneous melt; and

(2) adding organic diene co-agent and a free-radical initiator and continuing the mixing until the cross-linking of the rubber is essentially completed.

3. A continuous process for making a polymer blend suitable to blow moulding, comprising the following steps:

(1) mixing in a continuous melt blender;

20 to 70 weight percent of a mixture (A) of two or more polyalkylene phthalates,

wherein the mixture (A) is a mixture comprising;

(A1) block copolyester elastomer, and

(A2) poly(butylene terephthalate);

2 to 60 weight percent of rubber comprising poly(meth)acrylate or polymer comprised of ethylene and methyl acrylate, said rubber capable of being dynamically cross-linked;

0.5 to 20 weight percent of ionomer, comprising copolymers of ethylene and methacrylic acid, the ionomer having acid moieties from about 10 to 100 mol percent neutralized;

1 to 30 weight percent of terpolymer of ethylene, butylacrylate and glycidylmethacrylate, organic diene co-agent and a free-radical initiator; and

(2) heating at a temperature sufficient to melt all the components to make a homogeneous melt and continuing the mixing until the cross-linking of the rubber is essentially completed.