High flow polyester composition

• US 7,825,176 B2
• Filed: 08/31/2005
• Issued: 11/02/2010
• Est. Priority Date: 08/31/2005
• Status: Active Grant

• Current Assignee: SABIC Global Technologies BV (Government of Saudi Arabia)
• Original Assignee: Sabic Innovative Plastics IP BV (Government of Saudi Arabia)
• Inventors: Juikar, Vishvajit Chandrakant, Krishnaswami, Srinivasan, Mishra, Sanjay Braj, Kannan, Ganesh, Karanam, Sreepadaraj, Kim, Sung Dug
• Primary Examiner(s): Mulcahy; Peter D
• Application Number:
  US11/216,792
• Publication Number:
  US 20070049667A1
• Time in Patent Office: 1,889 Days
• Field of Search: 524/377, 524/387, 524/386, 524/383, 524/249
• US Class Current: 524/249
• CPC Class Codes: C08K 5/053 Polyhydroxylic alcohols
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence

Abstract

A high flow polyester composition is disclosed, which comprises at least one polyester and at least one flow enhancing ingredient of structure, I,

where, R₁=NH₂ or CH2OH; R₂=CH₃, CH₃CH₂ or CH₂OH or any of C1-C20 alkyl group which may have one or more hydroxy group substituent, C3-C20 cycloalkyl group, C6-C20 aryl group, C1-C20 alkoxy group which may have one or more hydroxy group substituent or C6-C20 aryloxy group. A good balance of flowability and mechanical properties is obtained by controlling the amount of the said flow-enhancing ingredient. The composition further comprises reinforcing fillers, impact modifiers, a property-enhancing thermoplastic such as polycarbonate and flame retardant chemicals. The compositions are suitable for making automotive, electric and electronic parts.

Claims

1. A polyester molding composition of high flowability comprising

(a) about 5 to about 99% by weight of at least one polyester, wherein the polyester is a poly(alkylene phthalate), poly(alkylene isophthalate), poly(alkylene terephthalate), poly(cycloalkylene terephthalate), poly(cycloalkylene cycloaliphatic dicarboxylate), poly(alkylene dicarboxylate), esteramide copolymers, a copolyester derived from structural units comprising at least one alkane diol or cycloaliphatic diol and at least one aromatic diacid, aliphatic diacid or cycloaliphatic diacid or a combination thereof, and wherein the polyester has a weight average molecular weight, M_w, in the range 10,000 to 120,000 daltons;

and

(b) about 0.05 to about 2% by weight of an alcohol of structure I,

2. The composition of claim 1 further comprising at least one reinforcing filler selected from carbon fibers, short glass fibers, long glass fibers, mica, talc, wollastonite, clay, polyester fibers, aramid fibers, and fibrillating tetrafluoro ethylene.

3. The composition of claim 1 further comprising at least one flame retardant chemical selected from halogenated oligocarbonate, poly(haloaryl acrylate), poly(haloaryl methacrylate), organophosphates, metal salts of organophosphinates, and metal salts of phosphinates.

4. The composition of claim 1 further comprising at least one property-modifying thermoplastic other than a polyester or an impact modifier, and which is selected from polycarbonate, polyamide, polyolefin, polyphenylene ether, polyphenylene sulfide and polyetherimide.

5. The composition of claim 1 further comprising about 0.1-5% by weight of an additive, said additive is at least one selected from carboxyl-reactive mono or di or polyfunctional epoxy chain extenders, anti-oxidants, colorants, mold release agents, nucleating agents, UV light stabilizers, heat stabilizers, and lubricants.

6. A shaped article molded from the composition of claim 1.

7. A polyester molding composition comprising

a) about 5 to about 99% by weight of at least one polybutylene terephthalate, wherein the polybutylene terephthalate has a weight average molecular weight, Mw, in the range 10,000 to 120,000 daltons;

b) about 0.05 to about 1% by weight of at least one alcohol of structure I,