초록 ▼

Film-backed and paper-backed coated abrasives and methods of making same are described using coatable urea-aldehyde binder precursor compositions including a urea-aldehyde resin and a cocatalyst, which yield more consistent quality coated abrasives. In addition, the compositions have longer pot life

Film-backed and paper-backed coated abrasives and methods of making same are described using coatable urea-aldehyde binder precursor compositions including a urea-aldehyde resin and a cocatalyst, which yield more consistent quality coated abrasives. In addition, the compositions have longer pot life and allow curing at lower temperatures. The urea-aldehyde resins have an aldehyde/urea molar ratio of at least about 1.0, more preferably ranging from about 1.0 to about 2.0, and a free aldehyde content ranging from about 0.1 to about 3.0 weight percent based on weight of total aldehyde. The cocatalyst consists essentially of a Lewis acid and a salt selected from the group consisting of ammonium ion salts and organic amine salts. Paper-backed abrasive articles may employ a fabric nonwoven layer between the abrasive coating and the paper layer to reduce abrasive particle shelling.

대표청구항 ▼

A coated abrasive comprising: (1) a backing comprising a polymeric film, the polymeric film having a front and back surface, said front surface being primed; (2) an abrasive coating bonded to the front surface of the polymeric film, the abrasive coating comprising a plurality of abrasive particles d

A coated abrasive comprising: (1) a backing comprising a polymeric film, the polymeric film having a front and back surface, said front surface being primed; (2) an abrasive coating bonded to the front surface of the polymeric film, the abrasive coating comprising a plurality of abrasive particles dispersed in a binder, the binder comprising a cured binder precursor composition comprising a major portion of a non-solidified urea-aldehyde resin, a minor portion of a solids portion of a latex, and a cocatalyst.