Process for making porous molded bodies of thermoplastic polymers
First Claim
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1. A process for making a molded body from thermoplastic polymers, comprising the steps of:
- (a) mixing a pulverulent polymer and a liquid to provide a mixture, wherein the pulverulent polymer has a mean particle size of 2 to 300 microns;
(b) introducing the mixture into a molding apparatus;
(c) sintering the mixture in said molding apparatus at a temperature and for a time period such that complete melting and fusion of the polymer is avoided;
(d) optionally cooling the sintered mixture; and
, (e) separating the liquid from the sintered mixture, wherein the liquid has a boiling temperature at least as high as the sintering temperature and wherein the polymer is substantially insoluble in the liquid during said mixing and sintering steps.
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Abstract
The manufacture of porous molded bodies by sintering of a mixture of powderous thermoplastic polymers and a liquid is described, the boiling point of the latter being at least equal to or higher than the sintering temperature. Sintering takes places in a mould, the process may be performed continuously and is suitable for the manufacture of porous molded bodies such as pipes, panels and the like which can be used as filter, gas distribution, air distribution, coalescing elements, as suction elements for oil, as carriers of active substances etc.
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Citations
14 Claims
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1. A process for making a molded body from thermoplastic polymers, comprising the steps of:
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(a) mixing a pulverulent polymer and a liquid to provide a mixture, wherein the pulverulent polymer has a mean particle size of 2 to 300 microns;
(b) introducing the mixture into a molding apparatus;
(c) sintering the mixture in said molding apparatus at a temperature and for a time period such that complete melting and fusion of the polymer is avoided;
(d) optionally cooling the sintered mixture; and
,(e) separating the liquid from the sintered mixture, wherein the liquid has a boiling temperature at least as high as the sintering temperature and wherein the polymer is substantially insoluble in the liquid during said mixing and sintering steps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification