B - Operations – Transporting – 24 – D
Patent
B - Operations, Transporting
24
D
57/6, 204/91.43
B24D 3/28 (2006.01) B24D 3/30 (2006.01)
Patent
CA 1253700
Abstract This invention relates to coated abrasive products having a resinous binder which holds and supports abrasive granules on a backing sheet. In the manufacture of coated abrasives, the make coat resinous binder and abrasive granules are first applied to the backing, then the size coat resinous binder is applied, and finally, the construction is fully cured. Generally, thermally curable binders provide coated abrasives having excellent properties, e.g. heat resistance. With polyester or cellulose backings, however, curing temperatures are limited to about 130° C. At this temperature, cure times are long. The long cure times necessitate the use of festoon curing areas. Disadvan- tages of festoon curing areas include formation of defects at the suspension rods, inconsistent cure on account of temperature variations in the large festoon ovens, sagging of the binder, and shifting of abrasive granules. Furthermore festoon curing areas require large amounts of space and large amounts of energy. This invention provides a coated abrasive product comprising abrasive granules adherently bonded to at least one major surface of a backing sheet by a radiation curable resinous binder material. The binder material can be used to form the make coat, size coat, or both coats. Alternatively, the binder material can be used in embodiments where only a single binder coat is employed. The radiation curable resinous binder material comprises a copolymer formed from a mixture comprising (1) at least one monomer selected from the group consisting of isocyanurate derivatives having at least one terminal or pendant acrylate group and isocyanate derivatives having at least one terminal or pendant acrylate group, and (2) at least one aliphatic or cycloaliphatic monomer having at least one terminal or pendant acrylate group.
510630
Boettcher Thomas E.
Thalacker Victor P.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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