# US 2019/0375933 A1 · Poly(butylene terephthalate) composition for articles having high dimensional stability

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- Number: US 2019/0375933 A1
- Document ID: US20190375933A1
- Status: Published application
- Kind: A1
- Application number: 16/470,833
- Filed: 2017-12-21
- Published: 2019-12-12
- Earliest claimed: 2016-12-21
- Applicants: Sabic Global Technologies B.V.
- Inventors: Sjoerd Van Nispen
- Web page: https://patentgrep.com/patent/US20190375933A1

## CPC

- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- B29C 45/0001: {characterised by the choice of material}
- C08K 3/34: Silicon-containing compounds
- C08K 3/346: {Clay}
- C08K 5/0083: {Nucleating agents promoting the crystallisation of the polymer matrix}
- C08K 5/098: Metal salts of carboxylic acids
- C08K 5/521: Esters of phosphoric acids, e.g. of H3PO4
- B29C 2045/0094: {injection moulding of small-sized articles, e.g. microarticles, ultra thin articles}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention relates to a polymer composition comprising poly(butylene terephthalate) and one or more nucleating agent. Such polymer composition allows for the production of small parts at a high cooling rate in injection moulding whilst still at a high degree of dimensional stability.

## Claims

### Claim 1

A polymer composition comprising:
poly(butylene terephthalate); and
a nucleating agent.

### Claim 2 (depends on 1)

The polymer composition according to claim 1, wherein the cooling curve of the polymer composition as determined via differential scanning calorimetry (DSC) according to ISO 11357-1 (2016), second cooling run, at a cooling rate of 90° C./min shows a crystallisation temperature Tp,c of ≥190° C.

### Claim 3 (depends on 1)

The polymer composition according to claim 1, wherein the nucleating agent is selected from benzoic acid salts, substituted benzoic acid salts, bicyclic dicarboxylate metal salts, hexahydrophthalic acid metal salts, sorbitol acetals, phosphate ester salts, glycerolate salts, di-, tri-, and tetra-amides, pine rosin derivatives, talc, kaolin, phosphate salts of aluminium, lithium, calcium, sodium, zinc or potassium, calcium, magnesium, aluminium, zinc, sodium or potassium salts of organic acids comprising 10-30 carbon atoms, compounds comprising a sorbitol moiety, organic amides comprising 5 to 40 carbon atoms, and combinations thereof.

### Claim 4 (depends on 1)

The polymer composition according to claim 1, wherein the polymer composition comprises ≥95.0 wt % of the poly(butylene terephthalate) with regard to the total weight of the polymer composition.

### Claim 5 (depends on 1)

The polymer composition according to claim 1, wherein the polymer composition comprises ≥98.0 wt % of the poly(butylene terephthalate) with regard to the total weight of the polymer composition.

### Claim 6 (depends on 1)

The polymer composition according to claim 1, wherein the polymer composition comprises ≥0.01 and ≤2.00 wt % of the nucleating agent with regard to the total weight of the polymer composition.

### Claim 7 (depends on 1)

The polymer composition according to claim 1, wherein the polymer composition comprises ≥0.01 and ≤0.50 wt % of the nucleating agent with regard to the total weight of the polymer composition.

### Claim 8 (depends on 1)

The polymer composition according to claim 1, wherein the nucleating agent is selected from talc, zinc stearate, sodium stearate, sodium acetate, sodium montanate, calcium 1R,2S-cyclohexanedicarboxylate, 2,2-methylenebis(4,6-di-tert-butylphenyl) phosphate aluminium hydroxide salt, endo-norbornane-2,3-dicarboxylic acid disodium salt, or combinations thereof.

### Claim 9 (depends on 1)

The polymer composition according to claim 1, wherein the poly(butylene terephthalate) has an intrinsic viscosity of ≥0.50 and ≤2.00 dl/g as determined in accordance with ASTM D2857-95 (2007).

### Claim 10 (depends on 1)

The polymer composition according to claim 1, wherein the poly(butylene terephthalate) comprises ≥90.0 wt % of polymeric units derived from 1,4-butanediol and terephthalic acid or dimethyl terephthalate, with regard to the total weight of the poly(butylene terephthalate).

### Claim 11 (depends on 1)

A process for the production of a polymer composition according to claim 1 via melt compounding in a melt extruder.

### Claim 12 (depends on 1)

The process for the production of a shaped article by an injection moulding process using the polymer composition according to claim 1.

### Claim 13 (depends on 12)

The process according to claim 12, in which the polymer composition is introduced into a mould in the molten state cooled to below the melt temperature to obtain a shaped article.

### Claim 14 (depends on 12)

The process according to claim 12, wherein the shaped article has a volume of ≤1.0 ml.

### Claim 15 (depends on 1)

A shaped article having a volume of ≤1.0 ml produced using the polymer composition according to claim 1.