(19)
(11) EP 0 071 723 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.09.1984 Bulletin 1984/36

(43) Date of publication A2:
16.02.1983 Bulletin 1983/07

(21) Application number: 82105371

(22) Date of filing: 18.06.1982
(84) Designated Contracting States:
AT CH DE FR GB IT LI SE

(30) Priority: 10.08.1981 US 291205

(71) Applicant: NORTON COMPANY
 ()

(72) Inventor:
  • Ibrahim, Mohamed Mostafa
     ()

   


(54) Coated abrasive


(57) A coated abrasive of improved resistance to «ioading» comprising a flexible backing, a plurality of abrasive grit particles dispersed over the area of at least one surface of said backing, and at least one layer of adhesive bond ma- teriai adhering said abrasive grit particles to each other and to said backing, characterized by the fact that the outermost layer of said adhesive bond material comprises:

(a) animal giue, or a cured amino resin, or a mixture thereof in an amount of at least 40% by weight of the total adhesive bond material, exclusive of any filler; and

(b) at least 0.74 grams per square meter of an additive which is

(1) a mono-, di-, and tri-organyl ester of orthophosphoric acid,

(2) a salt of a mono-, di-, and tri-organyl ester of orthophosphoric acid with an amine,

(3) a tetraorganyiammonium sait, or

(4) a soluble mixture thereof. Best results are obtained with a sizer adhesive of amino resin containing phosphate esters or their amine salts as additive.







Search report