Binder for manufacturing inorganic sintered body
The present invention provides a binder for manufacturing an inorganic sintered body that has excellent adhesiveness upon heat pressing and thermal decomposability and, especially when used as a binder for a ceramic green sheet, provides a ceramic green sheet having sufficient mechanical strength and flexibility. The present invention also provides a paste for manufacturing an inorganic sintered body, a ceramic green sheet, and a ceramic laminate individually manufactured using the binder for manufacturing an inorganic sintered body. The present invention provides a binder for manufacturing an inorganic sintered body containing a graft copolymer having a unit including polyvinyl butyral and a unit including a poly(meth)acrylic compound, the polyvinyl butyral having a polymerization degree of 800 to 5000, a hydroxy group content of 20 to 40 mol %, and a butyralization degree of 60 to 80 mol %, the unit including a poly(meth)acrylic compound having a glass transition temperature of 0 to 110° C.
1. A binder for manufacturing an inorganic sintered body containing a graft copolymer, the graft copolymer having a unit including polyvinyl butyral and a unit including a poly(meth)acrylic compound,
the polyvinyl butyral having a polymerization degree of 800 to 5000, a hydroxy group content of 20 to 40 mol %, and a butyralization degree of 60 to 80 mol %,
the unit including a poly(meth)acrylic compound having a glass transition temperature of 0 to 110° C.
2. The binder for manufacturing an inorganic sintered body according to claim 1 ,
wherein an average glass transition temperature obtained by calculation using Equation (1) is 20 to 80° C.:
Average glass transition temperature={(Glass transition temperature of unit including polyvinyl butyral)×(Amount of unit including polyvinyl butyral in graft copolymer)}+{(Glass transition temperature of unit including poly(meth)acrylic compound)×(Amount of unit including poly(meth)acrylic compound in graft copolymer)} (1).
3. The binder for manufacturing an inorganic sintered body according to claim 1 ,
wherein the graft copolymer having a unit including polyvinyl butyral and a unit including a poly(meth)acrylic compound contains 10 to 90% by weight of the unit including polyvinyl butyral and 10 to 90% by weight of the unit including a poly(meth)acrylic compound.
4. The binder for manufacturing an inorganic sintered body according to claim 1 ,
wherein the poly(meth)acrylic compound includes a (meth)acrylic compound containing 90% by weight or more of a methacrylic compound.
5. The binder for manufacturing an inorganic sintered body according to claim 1 ,
wherein the poly(meth)acrylic compound includes a (meth)acrylic compound containing 3 to 50% by weight of a (meth)acrylic compound having a carboxyl group, hydroxy group, epoxy group, or ether group in a molecule.
6. A paste for manufacturing an inorganic sintered body comprising:
the binder for manufacturing an inorganic sintered body according to claim 1 ;
an organic solvent; and
inorganic fine particles.
7. A ceramic green sheet formed using the paste for manufacturing an inorganic sintered body according to claim 6 .
8. A ceramic laminate obtained by laminating and heat-pressing a plurality of the ceramic green sheets according to claim 7 ,
the binder for manufacturing an inorganic sintered body having an average glass transition temperature that is lower than a heat-pressing temperature by at least 10° C.
9. The binder for manufacturing an inorganic sintered body according to claim 2 ,
wherein the graft copolymer having a unit including polyvinyl butyral and a unit including a poly(meth)acrylic compound contains 10 to 90% by weight of the unit including polyvinyl butyral and 10 to 90% by weight of the unit including a poly(meth)acrylic compound.
10. The binder for manufacturing an inorganic sintered body according to claim 2 ,
wherein the poly(meth)acrylic compound includes a (meth)acrylic compound containing 90% by weight or more of a methacrylic compound.
11. The binder for manufacturing an inorganic sintered body according to claim 3 ,
wherein the poly(meth)acrylic compound includes a (meth)acrylic compound containing 90% by weight or more of a methacrylic compound.
12. The binder for manufacturing an inorganic sintered body according to claim 2 ,
wherein the poly(meth)acrylic compound includes a (meth)acrylic compound containing 3 to 50% by weight of a (meth)acrylic compound having a carboxyl group, hydroxy group, epoxy group, or ether group in a molecule.
13. The binder for manufacturing an inorganic sintered body according to claim 3 ,
wherein the poly(meth)acrylic compound includes a (meth)acrylic compound containing 3 to 50% by weight of a (meth)acrylic compound having a carboxyl group, hydroxy group, epoxy group, or ether group in a molecule.
14. A paste for manufacturing an inorganic sintered body comprising:
the binder for manufacturing an inorganic sintered body according to claim 2 ;
an organic solvent; and
inorganic fine particles.
15. A paste for manufacturing an inorganic sintered body comprising:
the binder for manufacturing an inorganic sintered body according to claim 3 ;
an organic solvent; and
inorganic fine particles.
16. A paste for manufacturing an inorganic sintered body comprising:
the binder for manufacturing an inorganic sintered body according to claim 4 ;
an organic solvent; and
inorganic fine particles.
17. A paste for manufacturing an inorganic sintered body comprising:
the binder for manufacturing an inorganic sintered body according to claim 5 ;
an organic solvent; and
inorganic fine particles.