Process for preparing particles of polyphenylene sulfide polymer

Patent metadata

Field	Value
Publication number	US-2024182635-A1
Application number	US-202418404978-A
Country	US
Kind code	A1
Filing date	Jan 5, 2024
Priority date	Jun 7, 2017
Publication date	Jun 6, 2024
Grant date	—

Abstract

The invention relates to a process for preparing particles of polyphenylene sulfide polymer (PPS), based on the use of a polyester polymer (PE) comprising units from a dicarboxylic acid component and a diol component, wherein at least 2 mol. % of the diol component is a poly(alkylene glycol). The process comprises the melt-blending of the PPS with the PE, the cooling the blend and the recovery of the particles by dissolution of the PE into water. The present invention relates to PPS particles obtained therefrom and to the use of these particles in SLS 3D printing, coatings and toughening of thermoset resins.

First claim

1 - 8 . (canceled)

9 . Particles of polyphenylene sulfide polymer (PPS) obtained by the process comprising the steps of:
melt-blending a mixture (M) comprising:
a) at least one PPS, and
b) at least one water-dispersible polyester polymer (PE) comprising units from:
at least one aromatic dicarboxylic acid component comprising:
at least one aromatic dicarboxylic acid selected from the group consisting of isophthalic acid (IPA), terephthalic acid (TPA), naphthalenedicarboxylic acid, 4,4′-bibenzoic acid, 2,5-pyridinedicarboxylic acid, 2,4-pyridinedicarboxylic acid, 3,5-pyridinedicarboxylic acid, 2,2-bis(4-carboxyphenyl)propane, bis(4-carboxyphenyl)methane, 2.2-bis(4-carboxyphenyl)hexafluoropropane, 2,2-bis(4-carboxyphenyl)ketone, 4,4-bis(4-carboxyphenyl)sulfone, 2,2-bis(3-carboxyphenyl)propane, bis(3-carboxyphenyl)methane, 2,2-bis(3-carboxyphenyl)hexafluoropropane, 2.2-bis(3-carboxyphenyl)ketone, bis(3-carboxyphenoxy)benzene, and mixtures thereof, and
an aromatic dicarboxylic acid containing at least one SO3M group attached to an aromatic nucleus, wherein M is H or a metal ion selected from the group consisting of sodium, lithium and potassium,
at least one diol component wherein the at least one diol is selected from the group consisting of ethylene glycol, diethylene glycol, 1,4-cyclohexanedimethanol, propane-1,2-diol, 2,2-dimethyl-1,3-propanediol and mixtures thereof, and at least 50 mol. % of the diol component, this proportion being based on the total number of moles of the diol component, is the diethylene glycol, and

processing the mixture (M) into pellets or strands, cooling the pellets or strands at a temperature below 80° C., contacting said pellets or strands with water, optionally heated to a temperature up to 95° C. to provide particles, recovering the particles, optionally drying the particles, and optionally sieving the particles; wherein the step of melt-blending takes place at a temperature above 250° C. and the particles of PPS have a D50 comprised between 5 um and 100 μm.

10 . Particles of polyphenylene sulfide polymer (PPS) produced by a process comprising :
melt-blending the PPS with at least one polyester polymer (PE) comprising units from:
at least one dicarboxylic acid component,
at least one diol component, wherein at least 2 mol. % of the diol component is a poly(alkylene glycol) having a formula (I):
H(O—C m H 2m ) n —OH

wherein m is an integer from 2 to 4 and n varies from 2 to 10, and dispersing the PE into water.

11 . (canceled)

12 . The particles of claim 9 , wherein the particles have:
a bulk density of at least 0.45, and a tapped density of at least 0.55.

13 . The particles of claim 9 , wherein the particles have a circularity and/or a roundness of at least 0.75.

14 . A method comprising: manufacturing three-dimensional objects using a laser-sintering based additive manufacturing system from the PPS particles of claim 9 .

15 . A method comprising:
toughening thermoset resins with the PPS particles of claim 9 .

Assignees

• Solvay Specialty Polymers Usa

Inventors

• Jeol Stéphane
• Branham Kelly D
• Roller David Blake

Classifications

• C08G63/6886 Primary

  Dicarboxylic acids and dihydroxy compounds · CPC title

• B29B9/10

  by moulding the material, i.e. treating it in the molten state · CPC title

• B29C64/153

  using layers of powder being selectively joined, e.g. by selective laser sintering or melting · CPC title

• C08G63/16

  Dicarboxylic acids and dihydroxy compounds · CPC title

• B29K2071/00

  Use of polyethers {, e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof}, as moulding material · CPC title