JPS62149714A - Resin composition for laminated sheet - Google Patents

Abstract

PURPOSE:To obtain the titled composition which can give a laminated sheet excellent in surface properties such as scratch resistance and cigarette-burn resistance, by adding a specifid poly(meth)acrylate (mixture) to a diallyl phthalate resin and/or an unsaturated polyester resin. CONSTITUTION:100pts.wt. diallyl phthalate resin and/or unsaturated polyester is mixed with 5-70pts.wt. dipentaerythritol poly(meth)acrylate (mixture) containing at least four (meth)acryloyl groups in the molecule [e.g., dipentaerythritol monohydroxy pentaacryllate (mixture)], a curing agent and, optionally, an internal mold release, a filler, a flame retardant, a polymerization inhibitor, a pigment, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a resin composition for a thermosetting resin laminate having improved properties of a cured product.

(Prior art) Thermosetting resin laminates, especially diallyl phthalate resin laminates, have excellent moldability and post-form processability, and are also known as laminates with excellent physical and chemical properties. Among them, decorative boards are popular as materials with a calm texture.

However, diallyl phthalate resin laminates are inferior to melamine resin laminates in terms of hardness and heat resistance such as cigarette resistance, and are particularly difficult to use for top plates such as desks and counters. Similar problems also occurred in unsaturated polyester resin laminates.

(Objective of the Invention) An object of the present invention is to provide a resin composition suitable for use in diallyl phthalate resin or unsaturated polyester resin laminates, which does not have the above-mentioned drawbacks and has improved surface properties.

(Structure of the Invention) The present invention provides polyacrylate or polymethacrylate of dipentaerythritol having four or more 7-acryloyl groups or methacryloyl groups in the molecule, in diallylphthalate resin, unsaturated polyester resin, or mixed resin thereof. This is a resin composition for laminates with improved properties of a cured product, which is characterized by containing an acrylate or a mixture thereof.

The diallyl phthalate resin in the present invention refers to a diallyl phthalate prepolymer such as already known ortho, iso or tere diallyl phthalate prepolymers alone, a mixture thereof, or a modified prepolymer thereof. Further, as the unsaturated polyester resin, those which are generally known to be liquid or solid at room temperature are used.

When an unsaturated polyester resin is used alone, a solid one is preferred from the viewpoint of workability. When used as a mixed resin, the mixing ratio of the two may be arbitrary, but when producing a laminate that takes advantage of the characteristics of diallyl phthalate resin, 20% of diallyl phthalate resin is required even if it is not included in the resin.

゛The dipentaerythritol polyacrylate or polymethacrylate (hereinafter both collectively referred to as poly(meth)acrylate) used in the present invention has an acryloyl group or methacryloyl group (hereinafter both collectively referred to as ()) in the molecule. Poly(meth)acrylates having four or more (referred to as meth)acryloyl groups) may be used alone or in mixtures. Poly or mono(meth)acrylates having three or less (meth)acryloyl groups do not have sufficient compatibility with diallyl phthalate resins or unsaturated polyester resins, and the desired effect cannot be obtained.

The poly(meth)acrylates used in the present invention include dipentaerythritol dihydroxytetraacrylate, dipentaerythritol dihydroxytetramethacrylate, dipentaerythritol monohydroxypentaacrylate, dipentaerythritol monohydroxypentamethacrylate, Dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, which can be used alone or as a mixture. The blending amount is 5 to 70 parts by weight per 100 parts by weight of diallyl phthalate resin, unsaturated polyester resin, or mixed resin thereof.
A suitable range is preferably 10 to 50 parts by weight. If it is less than 5 parts by weight, the desired effect of improving the surface properties of the present invention cannot be obtained, and if it exceeds 70 parts by weight, the cured product will become too hard and brittle, or the resin will become sticky during processing, resulting in poor workability. This will cause problems.

A commonly known curing agent for diallyl phthalate resin or unsaturated polyester resin is added to the composition of the present invention. If necessary, other reactive additives and additives commonly used in the technical field, such as internal mold release agents, fillers,
Flame retardant double polymerization inhibitor.

Pigments etc. can be added.

To manufacture a laminate using the composition of the present invention, the composition is dissolved in an appropriate solvent, for example, an organic solvent such as acetone, toluene, methyl ethyl ketone, etc. to prepare a resin liquid, and this is used as a base material according to the purpose. This is achieved by impregnating an appropriate amount of resin, drying, and then laminating and heating forming a core made of plywood paperboard or ordinary kraft paper impregnated with resin. Furthermore, after the base material impregnated with the composition of the present invention is heated and cured, it can be laminated onto a metal plate such as an aluminum plate using an adhesive.

Examples of the substrate for impregnation include printed paper, woven fabric, nonwoven fabric, and wood veneer. The heat molding conditions may be those of conventionally known diallyl phthalate resin or unsaturated polyester resin, and are usually 100-160'C11-60K(]/C
m2.1 to 60 minutes is sufficient.

(Effects of the Invention) A laminate using a composition containing poly(meth)acrylate of dipentaerythritol of the present invention has
Compared to conventional laminates using diallyl phthalate resin or unsaturated polyester resin, which do not contain acrylates, surface properties such as scratch hardness and cigarette resistance are dramatically improved. It can also be used for plates.

(Example) Examples 1 to 3 Comparative Examples 1 to 3 The resin composition shown in Table 1 was printed solidly with a basis weight of 100
CI/Impregnated the printing paper, and after drying, resin attached 5130
(1/7 Fl impregnated paper was obtained.

Separately, kraft paper impregnated with ordinary diallyl phthalate resin (total weight 240g/TIl, inner resin adhesion weight 100M)
Trl) Prepare 2 sheets, layer the upper 2 impregnated papers on top of the 2 sheets, and use a glossy mirror plate to 130'C130
It was pressed at kO/Cm2 and cooled with water 20 minutes after insertion to obtain a laminate.

The surface scratch hardness and cigarette resistance of the laminate were measured and the results are shown in Table 1.

Surface scratch hardness: 10-point average value according to JAS Standard A test, depth μ).

Cigarette resistance: Observation of the surface condition after a lit cigarette was left for 2 minutes and then wiped with methanol.

Evaluation (average of 2 points) ○ Almost no discoloration × Coloring due to burning In addition, in Comparative Example 2, the resin compositions did not mix and could not be molded. Comparative Example 3 is an example in which a different type of polyacrylate different from the poly(meth)acrylate used in the present invention was used.

Notes (1) to (4) in Table (1) are as follows.

(1) Methyl ethyl ketone 50% by weight solution viscosity (30°
C) 96.5 cp, iodine number 56.7 prepolymer (
2) Commercially available polyester resin with an acid value of 34.5, consisting of 1 mol of maleic acid, 1 mol of phthalic acid and 2 mol of propylene glycol.

Claims (1)

[Claims] Dipentaerythritol polyacrylate or polymethacrylate having four or more acryloyl groups or methacryloyl groups in the molecule, or a mixture thereof, is mixed with a diallyl phthalate resin, an unsaturated polyester resin, or a mixed resin thereof. A resin composition for laminates with improved cured product properties.