Photopolymerizable compositions including a polyurethane methacrylate polymer prepared using a polycarbonate diol, articles, and methods

Patent metadata

Field	Value
Publication number	US-11225535-B2
Application number	US-201917042243-A
Country	US
Kind code	B2
Filing date	May 21, 2019
Priority date	Jun 29, 2018
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

The present disclosure provides a photopolymerizable composition. The photopolymerizable composition includes a) 40-60 parts by weight of a monofunctional (meth)acrylate monomer, per 100 parts of the total photopolymerizable composition; b) a photoinitiator; and c) a polymerization reaction product of components. A cured homopolymer of the monofunctional (meth)acrylate monomer has a glass transition temperature of 125 degrees Celsius or greater. The polymerization reaction product of components includes i) a diisocyanate; ii) a hydroxy functional methacrylate; iii) a polycarbonate diol; and iv) a catalyst. The polymerization reaction product includes a polyurethane methacrylate polymer. Often, the polycarbonate diol has a number average molecular weight of greater than 1,000 grams per mole (g/mol) or a weighted average of all polycarbonate diols present in the components has a Mn of greater than 1,000 g/mol; alternatively, the polyurethane methacrylate polymer has a weight average molecular weight of 8,000 g/mol or greater. An article is also provided including the photopolymerizable composition reaction product. Further, the present disclosure provides articles and methods of making articles. Methods are additionally provided, including receiving, by a manufacturing device having one or more processors, a digital object comprising data specifying an article; and generating, with the manufacturing device by an additive manufacturing process, the article based on the digital object. A system is also provided, including a display that displays a 3D model of an article; and one or more processors that, in response to the 3D model selected by a user, cause a 3D printer to create a physical object of an article.

First claim

The invention claimed is:

1. A photopolymerizable composition comprising:
a) 40-60 parts by weight of a monofunctional (meth)acrylate monomer, per 100 parts of the total photopolymerizable composition, wherein a cured homopolymer of the monofunctional (meth)acrylate monomer has a T g of 125° C. or greater and a log P value of greater than 3, greater than 2, or greater than 1;
b) a photoinitiator, wherein the photoinitiator is present in an amount of 0.2 wt. % to 5 wt. %; and
c) a polymerization reaction product of components, the components comprising:
i) a diisocyanate;
ii) a hydroxy functional methacrylate of Formula (I):
HO-Q-(A) p   (I)

wherein Q is a polyvalent organic linking group, A is a methacryl functional group of the formula OC(═O)C(R 1 )═CH 2 , wherein R 1 is a lower alkyl of 1 to 4 carbon atoms, and wherein p is 1 or 2; and

iii) a polycarbonate diol of Formula (II):
H(O—R 2 —O—C(═O)) m —O—R 3 —OH  (II)

wherein each of R 2 in each (O—R 2 —O—C(═O)) repeat unit, and R 3 are independently an aliphatic, cycloaliphatic, or aliphatic/cycloaliphatic alkylene group and an average number of carbon atoms in a combination of all the R 2 and R 3 groups is 4 to 10, and m is 2 to 23, wherein either the polycarbonate diol has a number average molecular weight (Mn) of greater than 1,000 grams per mole (g/mol), wherein a ratio of the diisocyanate to the polycarbonate diols present in the components has a Mn of greater than 1 , 000 g/mol, wherein a ratio of the diisocyanate to the polycarbonate diol ranges from 4 molar equivalents of the isocyanate of the diisocyanate to 1 molar equivalent of the alcohol of the polycarbonate diol, to 4 molar equivalents of the isocyanate of the diisocyanate to 3 molar equivalents of the alcohol of the polycarbonate diol; and
iv) a catalyst;
wherein the polymerization reaction product comprises a polyurethane methacrylate polymer.

2. A photopolymerizable composition comprising:
a) 40-60 parts by weight of a monofunctional (meth)acrylate monomer, per 100 parts of the total photopolymerizable composition, wherein a cured homopolymer of the monofunctional (meth)acrylate monomer has a T g of 125° C. or greater and a log P value of greater than 3, greater than 2, or greater than 1;
b) a photoinitiator; and
c) a polymerization reaction product of components, the components comprising:
i) a diisocyanate;
ii) a hydroxy functional methacrylate of Formula (I):
HO-Q-(A) p   (I)

wherein Q is a polyvalent organic linking group, A is a methacryl functional group of the formula OC(═O)C(R 1 )═CH 2 , wherein R 1 is a lower alkyl of 1 to 4 carbon atoms, and wherein p is 1 or 2; and
iii) a polycarbonate diol of Formula (II):
H(O—R 2 —O—C(═O)) m —O—R 3 —OH  (II)

wherein each of R 2 in each (O—R 2 —O—C(═O)) repeat unit, and R 3 are independently an aliphatic, cycloaliphatic, or aliphatic/cycloaliphatic alkylene group and an average number of carbon atoms in a combination of all the R 2 and R 3 groups is 4 to 10, and m is 2 to 23, wherein either the polycarbonate diol has a Mn of greater than 1,000 grams per mole (g/mol) or a weighted average of all polycarbonate diols present in the composition has a Mn of greater than 1,000 g/mol, wherein a ratio of the diisocvanate to the polycarbonate diol ranges from 4 molar equivalents of the isocyanate of the diisocvanate to 1 molar equivalent of the alcohol of the polycarbonate diol, to 4 molar equivalents of the isocyanate of the diisocyanate to 3 molar equivalents of the alcohol of the polycarbonate diol; and
iv) a catalyst;

wherein the polymerization reaction product comprises a polyurethane methacrylate polymer having a weight average molecular weight (Mw) of 8,000 g/mol or greater.

3. The photopolymerizable composition of claim 1 , further comprising a compound of Formula (III):
(H 2 C═C(R 1 )C(═O)—O) p -Q-OC(═O)NH—R di —NHC(═O)O-Q-(O—C(═O)C(R 1 )═CH 2 ) p   (III)

wherein Q and R 1 are as defined for Formula (I), and Rai is the residue of a diisocyanate.

4. The photopolymerizable composition of claim 3 , wherein the compound of Formula (III) is present in an amount of 5 to 20 wt. %, based on the weight of the polymerizable composition.

5. The photopolymerizable composition of claim 1 , wherein the monofunctional (meth)acrylate monomer is selected from the group consisting of 3,3,5-trimethylcyclohexyl methacrylate, cis-4-tert-butyl-cyclohexylmethacrylate, 2-decahydronapthyl methacrylate, 1-adamantyl acrylate, 73/27 trans/cis-4-tert-butylcyclohexylmethacrylate, dicyclopentadienyl methacrylate, dicyclopentanyl methacrylate, trans-4-tert-butylcyclohexyl methacrylate, d,l-isobornyl methacrylate, dimethyl-1-adamantyl methacrylate, d,l-bornyl methacrylate, 3-tetracyclo[4.4.0.1.1]dodecyl methacrylate, 1-adamantyl methacrylate, and combinations thereof.

6. The photopolymerizable composition of claim 1 , wherein in the hydroxy functional methacrylate of Formula (I), Q is an alkylene group, p is 1, and in the methacryl functional group A, R 1 is methyl.

7. The photopolymerizable composition of claim 1 , wherein the polyurethane methacrylate polymer has a weight average molecular weight (Mw) of 6,000 g/mol to 35,000 g/mol.

8. The photopolymerizable composition of claim 1 , further comprising a UV absorber comprising an optical brightener in an amount of 0.001 to 5% by weight, based on the total weight of the photopolymerizable composition.

9. The photopolymerizable composition of claim 8 , wherein the optical brightener comprises a compound of Formula (VI):

10. The photopolymerizable composition of claim 1 , wherein a cured homopolymer of the monofunctional (meth)acrylate monomer has a T g of 155° C. or greater, 170° C. or greater, or 180° C. or greater.

11. The photopolymerizable composition of claim 1 , further comprising an inhibitor in an amount of 0.001 to 1 wt. %.

12. The photopolymerizable composition of claim 1 , essentially free of any monofunctional (meth)acrylate monomer having a log of octanol/water partition coefficient (log P) value of less than 3, less than 2, or less than 1.

13. An article comprising a photopolymerization reaction product of the photopolymerizable composition of claim 1 .

14. The article of claim 13 , exhibiting at least two properties selected from the group consisting of an initial relaxation modulus of 100 megapascals (MPa) or greater at 2% strain at 37° C., a percent loss of relaxation modulus of 70% or less, a 30 minute relaxation modulus of 100 MPa or greater, an elongation at break of a printed article of 20% or greater, and a tensile strength at yield of 14 MPa or greater.

15. A method of making an article, the method comprising:
a) obtaining a photopolymerizable composition comprising:
1) 40-60 parts by weight of a monofunctional (meth)acrylate monomer, per 100 parts of the total photopolymerizable composition, wherein a cured homopolymer of the monofunctional (meth)acrylate monomer has a T g of 125° C. or greater and a log P value of greater than 3, greater than 2, or greater than 1;
2) a photoinitiator, wherein the photoinitiator is present in an amount of 0.2 wt. % to 5 wt. %; and
3) a polymerization reaction product of components, the components comprising:
i) a diisocyanate;
ii) a hydroxy functional methacrylate of Formula (I):
HO-Q-(A) p   (I)

wherein Q is a polyvalent organic linking group, A is a methacryl functional group of the formula —OC(═O)C(R 1 )═CH 2 , wherein R 1 is a lower alkyl of 1 to 4 carbon atoms, and wherein p is 1 or 2;
ii

Assignees

• 3M Innovative Properties Co

Inventors

• Klun Thomas P
• Parkar Zeba
• Riedesel John M
• Pokorny Richard J
• Amb Chad M
• Coonce Benjamin R
• Clough Robert S
• Wu Tianyu
• Chakraborty Saswata
• Lu Yongshang
• Macmurray Benjamin C
• Dailey Ian
• Olson David B

Classifications

• C08G18/6755

  Unsaturated carboxylic acids · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• C08G18/44

  Polycarbonates · CPC title

• B29C64/129

  characterised by the energy source therefor, e.g. by global irradiation combined with a mask · CPC title

• C08K5/0041

  Optical brightening agents, organic pigments · CPC title