Concentrated compositions for coating corrugated board
AssigneeOwens-Illinois, Inc.
InventorJames C. Jones
Life of this patent
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Abstract
Concentrated aqueous solutions of at least about 20 wt. % of finely divided silica and at least about 15 to 20 wt. % urea are coated on corrugated board effectively and easily by sponging, the coating having non-skid properties, the quality of printing being enhanced and warp being reduced.
Claims17
A concentrated coating composition for coating corrugated board to reduce warp, enhance print quality and provide non-skid properties to the board, the composition comprising a mixture of:
- (a) about 20 to 40 wt. % of finely divided silica having an average particle size of about 0.01 to 1 micron;
- (b) about 20 to 40 wt. % of urea;
- and
- (c) about 20 to 60 wt. % of water, the weight ratio of silica/urea being about 0.5/1 to about 2.75/1, the composition being stable against premature gelling due to heat or cold and being stable through at least 4 cycles of freezing and thawing.
A concentrated composition for coating corrugated board efficiently by sponging, the coating composition providing non-skid properties to the board as well as reducing warp and enhancing the printing qualities of the board, the composition comprising:
- (a) about 30 to 70 wt. % of finely divided silica;
- (b) about 15 to 50 wt. % of urea;
- and
- (c) about 4 to 15 wt. % of water;
- the silica, urea and water being mixed and heated from about 140.degree. F. to 170.degree. F. to form a concentrated coating solution that is stable and does not gel prematurely due to heat or cold, the solution being stable through at least about four cycles of freezing and thawing.
A method of making a concentrated coating composition product that can easily be coated onto corrugated board by sponging, the coating composition reducing warp, improving print quality and providing non-skid properties to the board, the method comprising the steps of:
- (A) mixing about 30 wt. % to 70 wt. % of finely divided silica having an average particle size of about 0.01 to 0.1 micron;
- about 15 to 40 wt. % of urea;
- and about 4 to 15 wt. % water to form a mixture;
- and
- (B) heating the mixture at about 140.degree. F. to 170.degree. F. to provide a concentrated coating composition that does not gel prematurely due to heat or cold.
Dependencies are inferred from the claim text.