13-02-2020 дата публикации
Номер: US20200047418A1
The invention is directed to a process of manufacturing a three-dimensional object by—providing a support structure comprising polyvinyl alcohol (PVOH) to—depositing and solidifying a molten thermoplastic polymer on the support structure to form a three-dimensional preform characterized in that the support structure consists of a mixture of polyvinyl alcohol (PVOH) and at most 20% by weight of at least one plasticizer according to formula (I), (II) or (III): —R1-C(CH—OH)(1); —[R1-C(CH—OH)CH]O (11); —(R1)C(CH—OH)CH—O—CHC(CH—OH)C(R1)CH—O—CHC(CH—OH)2R1 (III). With R1=H, CH3, CH, CH, CHOH. The support structure can be dissolved to from the three-dimensional object. 1. A process of manufacturing a three-dimensional object , comprising:depositing and solidifying a molten thermoplastic polymer on a support structure to form a three-dimensional preform, [{'br': None, 'sub': 2', '3, 'R1-C(CH—OH)\u2003\u2003(I)'}, {'br': None, 'sub': 2', '2', '2', '2, '[R1-C(CH—OH)CH]O \u2003\u2003(II)'}, {'br': None, 'sub': 2', '2', '2—', '2', '2', '2—', '2', '2', '2, 'b': '13', '(R1)C(CH—OH)CHO—CHC(CH—OH)C(R1)CHO—CHC(CH OH)R1 \u2003\u2003(III)'}], 'wherein the support structure consists of a mixture of polyvinyl alcohol (PVOH) and at most 20% by weight of at least one plasticizer according to formula I, II or III{'sub': 3', '2', '5', '3', '7', '2, 'wherein R1 is H, CH, CH, CH, or CHOH.'}2. The process according to claim 1 , wherein the plasticizer is at least one selected from the group consisting of trimethylolpropane claim 1 , di(trimethylolpropane) claim 1 , pentaerythritol claim 1 , dipentaerythritol and tripentaerythritol.3. The process according to claim 1 , wherein the polyvinyl alcohol (PVOH) has a vinyl actetate content of at least 10 mol %.4. The process according to claim 1 , wherein the polyvinyl alcohol (PVOH) has a degree of polymerization of 200 to 3000.5. The process according to claim 1 , wherein the polyvinyl alcohol (PVOH) has a degree of hydrolysation DH of 60 to 99%.6. ...
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