Resin composite and method for producing resin composite

Patent metadata

Field	Value
Publication number	US-11034806-B2
Application number	US-201716074638-A
Country	US
Kind code	B2
Filing date	Feb 3, 2017
Priority date	Feb 3, 2016
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

It is an object of the present invention to provide a resin composite that is excellent in water resistance and is capable of exerting sufficient strength even under wet conditions. The present invention relates to a resin composite comprising a resin, fibers having an ionic functional group, and a polyvalent ion. The fibers having an ionic functional group are preferably cellulose fibers having a fiber width of 1000 nm or less.

First claim

The invention claimed is:

1. A resin composite comprising a resin and fibers having an ionic functional group, wherein the ionic functional groups is a phosphoric acid group, and a polyvalent ion-containing solution is applied to the composite, the polyvalent is a metal ion having a valence of 3, when the mass of the resin composite immersed in ion-exchanged water for 24 hours is defined as E and the mass of the resin composite left to stand for 24 hours under conditions of 23° C. and a relative humidity of 50% is defined as F, the water absorption rate represented by (E−F)/F×100 is 500% or less, the tensile strength of the resin composite immersed in ion-exchanged water for 24 hours is 5 MPa or more, and the fibers are uniformly dispersed in the resin composite.

2. The resin composite according to claim 1 , wherein the fibers are cellulose fibers having a fiber width of 1000 nm or less.

3. The resin composite according to claim 1 , wherein the resin is a hydrophilic resin.

4. The resin composite according to claim 1 , wherein when the area of the resin composite immersed in ion-exchanged water for 24 hours is defined as G and the area of the resin composite left to stand for 24 hours under conditions of 23° C. and a relative humidity of 50% is defined as H, the rate of expansion and contraction represented by G/H×100 is 130% or less.

5. The resin composite according to claim 1 , wherein the resin composite is a sheet.

6. The resin composite according to claim 1 , wherein in the case of measuring the concentrations of the fibers having an ionic functional group contained in the following regions (a) to (c), the fiber concentration ratio between two regions is less than 2:
(a) a region from one surface of the resin composite to 10% of the overall thickness of the resin composite,
(b) a region from the other surface of the resin composite to 10% of the overall thickness of the resin composite, and
(c) a region from the center plane in the thickness direction of the resin composite to ±5% (a total of 10%) of the overall thickness.

7. The resin composite according to claim 1 , wherein when the tensile strength of the resin composite immersed in ion-exchanged water for 24 hours is defined as A and the tensile strength of the resin composite left to stand for 24 hours under conditions of 23° C. and a relative humidity of 50% is defined as B, the residual rate of the tensile strength represented by AB×100 is 9% or more.

8. The resin composite according to claim 1 , wherein the tensile elastic modulus of the resin composite immersed in ion-exchanged water for 24 hours is 0.2 GPa or more.

9. The resin composite according to claim 1 , wherein when the tensile elastic modulus of the resin composite immersed in ion-exchanged water for 24 hours is defined as C and the tensile elastic modulus of the resin composite left to stand for 24 hours under conditions of 23° C. and a relative humidity of 50% is defined as D, the residual rate of the tensile elastic modulus represented by C/D×100 is 3% or more.

10. The resin composite according to claim 1 , wherein the resin composite is substantially free from lignophenol and lignophenol derivatives.

11. A method for producing a resin composite, comprising:
forming a composite by mixing a resin with fibers having an ionic functional group; and
applying a polyvalent ion-containing solution after forming the composite.

12. The method for producing a resin composite according to claim 11 , wherein the polyvalent ion-containing solution is an aqueous solution of an inorganic metal salt.

Assignees

• Oji Holdings Corp

Inventors

• Tsutsumi Yoshiyuki
• SAKAI Koh
• Noguchi Yuichi

Classifications

• C08B5/00 Primary

  Preparation of cellulose esters of inorganic acids {, e.g. phosphates (rendering cellulose suitable for esterification C08B1/02)} · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C08L101/00

  Compositions of unspecified macromolecular compounds · CPC title

• C08K2003/166

  Magnesium halide, e.g. magnesium chloride · CPC title

• C08J2401/02

  Cellulose; Modified cellulose · CPC title