IPC分类号：
B33Y70/00 | B33Y10/00 | B29C64/106 | C08F216/38 | B29C64/118
当前申请(专利权)人：
KURARAY EUROPE GMBH
原始申请(专利权)人：
KURARAY EUROPE GMBH
当前申请(专利权)人地址：
Phillip-Reis-Strasse 4,65795 Hattersheim,DE
发明人：
THE DESIGNATION OF THE INVENTOR HAS NOT YET BEEN FILED
代理机构：
JANSSEN, CHRISTIAN OLIVER
摘要：
The invention is directed to the use of polyvinyl acetals in additive manufacturing processes, especially for 3D printing process.
技术问题语段：
The technical problem addressed in this patent is the need for improved materials for additive manufacturing processes, especially for 3D printing, that offer better thermal stability, compatibility with other components of the printing material, and improved post-processing characteristics. The invention provides a solution by using polyvinyl acetals with improved properties, such as increased glass transition temperature and better thermal stability. The polyvinyl acetals used in the inventive process can be supplied in various forms, such as filaments or powders.
技术功效语段：
The invention is about using polyvinyl acetals in additive manufacturing processes, especially for 3D printing. Polyvinyl acetals have advantages and disadvantages for different applications, and the invention provides a process using a material with improved characteristics like thermal stability, glass transition temperature, and compatibility with other components of the printing material. The polyvinyl acetals used in the invention have at least two different acetal groups, and they can be supplied in various forms such as filaments or powders. The invention also provides a process for manufacturing polyvinyl acetals with a higher glass transition temperature while maintaining a softening temperature comparable to conventional PVB.
权利要求：
1. A process for the additive manufacturing of a three-dimensional object wherein the three-dimensional object comprises, consists of or consists essentially of a polyvinyl acetal and wherein the polyvinyl acetal comprises at least two different acetal groups.
2. The process according to claim 1 wherein the acetal groups independently have 2 to 6 carbon atoms.
3. The process according to claim 1 or 2 wherein the additive manufacturing is 3D printing.
4. The process according to any one of claims 1 to 3 wherein the polyvinyl acetal comprises butyraldehyde and acetaldehyde acetal groups.
5. The process according to any one of claims 1 to 4 wherein the polyvinyl acetal is supplied to the manufacturing process in form of a filament, granules, beads or a powder.
6. The process according to any one of claims 1 to 5 wherein the polyvinyl acetal has a glass transition temperature (Tg) of 75 to 115 ºC.
7. The process according to any one of claims 1 to 6 wherein the polyvinyl acetal has a melting temperature (Tm) of 150 to 240 ºC.
8. The process according to any one of claims 1 to 7 wherein the polyvinyl acetal has a degree of acetalisation of 70 to 95%.
9. The process according to any one of claims 1 to 8 comprising - a step of depositing and solidifying a molten thermoplastic polymer different from the polyvinyl acetal to form a support structure, - depositing and solidifying the molten polyvinyl acetal onto the support structure to form a three-dimensional preform, and - dissolving the support structure to form the three-dimensional object.
10. The process according to claim 9 wherein the thermoplastic polymer support structure comprises polyvinyl alcohol (PVOH).
11. Use of a polyvinyl acetal comprising at least two different acetal groups wherein the acetal groups independently have 2 to 6 carbon atoms for the manufacture of a three-dimensional object comprising, consisting of or consisting essentially of a polyvinyl acetal using additive manufacturing.
12. The use of claim 11 wherein the additive manufacturing is 3D printing.
13. A filament for use in 3D printing comprising, consisting essentially of or consisting of a polyvinyl acetal comprising at least two different acetal groups wherein the acetal groups independently have 2 to 6 carbon atoms.
14. A three-dimensional object obtained according to the process of any one of claims 1 to 10 comprising, consisting of or consisting essentially of a polyvinyl acetal wherein the polyvinyl acetal comprises at least two different acetal groups and the acetal groups independently have 2 to 6 carbon atoms.