Process for preparing a fluid conduit

Patent metadata

Field	Value
Publication number	US-11479639-B2
Application number	US-201716318792-A
Country	US
Kind code	B2
Filing date	Jul 11, 2017
Priority date	Jul 21, 2016
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

Processes for making a fluid conduits and fluid conduits made thereby are disclosed. The fluid conduits include a mono-layer formed of at least 80 wt %, based on total weight of the mono-layer, of a thermoplastic elastomer in an amount of at least 80 wt % with respect to the total weight of the mono-layer. The thermoplastic elastomer is preferably a block copolymer elastomer formed of hard segments (e.g., polyesters, polyamides and/or polyurethanes) and soft segments (e.g., aliphatic polyethers, aliphatic polyesters and/or aliphatic polycarbonates) and exhibits a melt flow rate measured at 230° C. under a load of 10 kg (MFR 230° C./10 kg), according to ISO1133 (2011) of at most 40 g/10 min and having a heat resistance of at least 250 hours at 175° C. at which the elongation at break remains at least 100% as measured according to ISO 527 with a test speed of 50 mm/min.

First claim

The invention claimed is:

1. A process for preparing a fluid conduit comprising a mono-layer comprising a thermoplastic elastomer in an amount of at least 80 wt % with respect to the total weight of the mono-layer, comprising at least the following steps:
(a) melting a composition comprising at least a thermoplastic elastomer, wherein the thermoplastic elastomer has a melt flow rate measured at 230° C. under a load of 10 kg (MFR 230° C./10 kg), according to ISO1133 (2011) of at most 40 g/10 min and having a heat resistance of at least 250 hours at 175° C. at which the elongation at break remains at least 100% as measured according to ISO 527 with a test speed of 50 mm/min to thereby form a melt of the composition, and wherein the thermoplastic elastomer comprises:
(ii) hard segments selected from the group consisting of polyester, polyamide and polyurethane, and
(ii) soft segments selected from the group consisting of aliphatic polyether, aliphatic polyester and aliphatic polycarbonate; and wherein
the hard and soft segments are present in a ratio of the hard segments to the soft segments of between 20:80 and 90:10;

(b) forming a parison from the melt of the composition;
(c) placing the parison in a mold;
(d) blowing-up the parison against the mold; and
(e) cooling down the mold to thereby obtain the fluid conduit comprising the mono-layer.

2. The process according to claim 1 , wherein step (c) comprises placing the parison in a mold by drawing the parison through the mold by reduced pressure or by clamping the parison in the mold.

3. The process according to claim 1 , wherein the soft segments comprise an aliphatic polycarbonate made up of repeating units from at least one alkylene carbonate.

4. The process according to claim 3 , wherein the alkylene carbonate repeating units are represented by formula 1:

where R=H and/or alkyl, and X=2−20.

5. The process according to claim 4 , wherein R=H and X=6.

6. The process according to claim 3 , wherein the hard segments comprise a polyester.

7. The process according to claim 1 , wherein the mono-layer comprises at least 90 wt % of the thermoplastic elastomer with respect to the total weight of the mono-layer.

Assignees

• Dsm Ip Assets Bv

Inventors

• Van Hemelrijck Ellen
• Van Moll Marco
• Baseotto Michel

Classifications

• C08J2369/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• B29K2067/006

  PBT, i.e. polybutylene terephthalate · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08J5/00 Primary

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title

• C08L77/12

  Polyester-amides · CPC title