IPC分类号：
B29C64/118 | B33Y70/00 | B33Y80/00 | C08F210/02 | C08F216/38
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：
Philipp-Reis-Straße 4,65795 Hattersheim am Main DE
摘要：
The invention is directed to the use of ethylene vinyl acetals in additive manufacturing processes, especially for 3D printing process.
技术问题语段：
The patent text discusses the use of ethylene vinyl acetals in additive manufacturing processes, specifically 3D printing. The technical problem addressed is the need for improved materials for additive manufacturing technologies, as current materials have drawbacks such as high processing temperatures and degradation during production. The invention provides a solution by using ethylene vinyl acetals, which offer improved characteristics such as thermal stability, melting point, viscosity, water uptake profile, and compatibility with other components of the printing material. The ethylene vinyl acetals can be obtained by reacting ethylene vinyl alcohol with ethylene in the presence of a catalyst. The percentage of ethylene units in the ethylene vinyl acetal is preferably 25 to 60 mol%. The acetal groups have 1 to 7 carbon atoms and can be derived from the condensation reaction with aldehydes with 1 to 7 carbon atoms. The ethylene vinyl acetals used in the invention are mixed acetals, comprising at least two different acetal groups.
技术功效语段：
The present invention provides a process for the additive manufacturing of three-dimensional objects using ethylene vinyl acetals as a material for the process. The use of ethylene vinyl acetals has advantages over other materials used in additive manufacturing processes, such as higher production costs and environmental footprint. The ethylene vinyl acetals used in the invention have improved characteristics such as thermal stability, viscosity, and compatibility with other components of the printing material. The invention solves the problem of high temperatures and degradation of materials in additive manufacturing processes. The ethylene vinyl acetals can be obtained by reacting ethylene with ethylene vinyl alcohols. The percentage of ethylene units in the ethylene vinyl acetal is preferably 25 to 60 mol%. The acetal groups have 1 to 7 carbon atoms and are derived from the condensation reaction with aldehydes with 1 to 7 carbon atoms. The ethylene vinyl acetals used in the invention are mixed acetals, i.e. they comprise at least two different acetal groups.
权利要求：
Claims
1 . A process for the additive manufacturing of a three-dimensional object wherein the three-dimensional object comprises, consists of or consists essentially of an ethylene vinyl acetal.
2. The process according to claim 1 wherein the additive manufacturing is 3D printing.
3. The process according to claim 1 or 2 wherein the acetal group has 1 to 7 carbon atoms.
4. The process according to any one of claims 1 to 3 wherein the acetal group is derived from n-butyraldehyde and/or iso-butyraldehyde acetal.
5. The process according to any one of claims 1 to 4 wherein the ethylene vinyl acetal is supplied to the manufacturing process in form of a filament, granules, beads, pellets or a powder.
6. The process according to any one of claims 1 to 5 wherein the ethylene vinyl acetal has a glass transition temperature (Tg) of 30 to 75 -C.
7. The process according to any one of claims 1 to 6 wherein the ethylene vinyl acetal has a melting temperature (Tm) of 90 to 180 -C.
8. The process according to any one of claims 1 to 7 wherein the ethylene vinyl acetal has a degree of acetalisation of 5 to 40 mol%.
9. The process according to any one of claims 1 to 8 wherein the ethylene vinyl acetal comprises ethylene units in the range of 25 to 60 mol%.
10. The process according to any one of claims 1 to 9 comprising
- a step of depositing and solidifying a molten thermoplastic polymer different from the ethylene vinyl acetal to form a support structure,
- depositing and solidifying the molten ethylene vinyl acetal onto the support structure to form a three-dimensional preform, and subsequently
- dissolving the support structure to form the three-dimensional object.
11 .The process according to claim 10 wherein the thermoplastic polymer support structure comprises polyvinyl alcohol (PVOH).
12. Use of an ethylene vinyl acetal for the manufacture of a three-dimensional object comprising, consisting of or consisting essentially of an ethylene vinyl acetal using additive manufacturing.
13. The use of claim 12 wherein the additive manufacturing is 3D printing.
14. A filament for use in 3D printing comprising, consisting essentially of or consisting of an ethylene vinyl acetal.
15. A three-dimensional object obtained according to the process of any one of claims 1 to 1 1 comprising, consisting of or consisting essentially of an ethylene vinyl acetal.