Embossed release paper for synthetic leather production and support therefor, and synthetic leather using the release paper and process for producing the synthetic leather
First Claim
1. An embossed release paper for synthetic leather production, comprising at least paper as a support and an ionizing radiation cured film provided on the paper, the upper part of the cured film having been embossed, characterized in that the ionizing radiation cured film has been formed by applying an ionizing radiation to a coating liquid comprising at least an ionizing radiation curing composition having a softening point of 40°
- C. or above, to cure the ionizing radiation curing composition, the ionizing radiation curing composition comprising a product of a reaction of an isocyanate compound with an (meth)acrylic compound containing an (meth)acryloyl group and reactive with the isocyanate compound, or a product of a reaction of an isocyanate compound with an (meth)acrylic compound containing an (meth)acryloyl group and reactive with the isocyanate compound, and a compound free from an (meth)acryloyl group and reactive with an isocyanate group.
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Accused Products
Abstract
This invention provides an embossed release paper for synthetic leather production, which has embossability, heat resistance and durability and, at the same time, has excellent separability from a two-pack curing type PU adhesive and can be used in all of synthetic leathers such as PU, PVC, and semisynthetic leathers, and a process for producing the same. The embossed release paper for synthetic leather production comprises at least paper as a support and an ionizing radiation cured film provided on the paper. The upper part of the cured film has been embossed. The ionizing radiation cured film has been formed by applying an ionizing radiation to a coating liquid having a specific composition to cure the coating liquid.
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Citations
32 Claims
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1. An embossed release paper for synthetic leather production, comprising at least paper as a support and an ionizing radiation cured film provided on the paper, the upper part of the cured film having been embossed, characterized in that
the ionizing radiation cured film has been formed by applying an ionizing radiation to a coating liquid comprising at least an ionizing radiation curing composition having a softening point of 40° - C. or above, to cure the ionizing radiation curing composition, the ionizing radiation curing composition comprising
a product of a reaction of an isocyanate compound with an (meth)acrylic compound containing an (meth)acryloyl group and reactive with the isocyanate compound, or a product of a reaction of an isocyanate compound with an (meth)acrylic compound containing an (meth)acryloyl group and reactive with the isocyanate compound, and a compound free from an (meth)acryloyl group and reactive with an isocyanate group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 28)
- C. or above, to cure the ionizing radiation curing composition, the ionizing radiation curing composition comprising
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26. A support for use in an embossed release paper for synthetic leather production, the support comprising a base paper having a clay coating layer on its one side, characterized in that
the base paper has such a heat resistance that the tensile strength as measured after standing at 230° - C. for 3 min by the measuring method specified in JIS P 8113 is maintained at not less than 10 kN/m at least in the machine direction and the tear strength as measured after standing at 230°
C. for 3 min by the measuring method specified in JIS P 8116 is maintained at not less than 500 mN in both the machine direction and cross direction, andthe clay coat layer has a smoothness of not less than 100 sec as measured by the measuring method specified in JIS P 8119 and has been formed so that surface irregularities derived from pulp fibers constituting the base paper are absorbed. - View Dependent Claims (27, 29, 30, 31, 32)
- C. for 3 min by the measuring method specified in JIS P 8113 is maintained at not less than 10 kN/m at least in the machine direction and the tear strength as measured after standing at 230°
Specification