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US 2015/0152604 A1Published application
Dimensionally stable paper and production method thereof
AssigneeA. Ahlstrom Corporation
InventorsBernd Ullmann, Holger Arnold
Life of this patent
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Abstract
A dimensionally stable paper and paper products, a production method for such paper, and uses of substances for conveying, modifying or improving dimensional stability of paper.
Claims21
Dimensionally stable paper, comprising a raw paper impregnated on at least one face with an impregnation mixture, the impregnation mixture comprising:
- at least one sugar alcohol having a general formula
- HOCH2[CH(OH)]nCH2OH, wherein n=2,3,4 or 5;
- an urea;
- and
- at least one substance selected from polyalkylene glycol and glycerin.
2 more elements
A method for producing a paper having good dimensional stability, comprising the steps:
- producing a water based impregnation mixture comprising
- a sugar alcohol having a general formula
- HOCH2[CH(OH)]nCH2OH wherein n=2,3,4 or 5,
- an urea, and
- a polyalkylene glycol and/or glycerin;
- and
- impregnating a raw paper with the impregnation mixture.
4 more elements
A method of applying an impregnation mixture comprising
- a sugar alcohol having a general formula
- HOCH2[CH(OH)]nCH2OH with n=2,3,4 or 5,
- an urea and
- a polyalkylene glycol, preferably polyethylene glycol, and/or glycerin
- for conveying, modifying or improving dimensional stability of a paper, to a wet expansion of at most 0.8% of the paper size in equilibrium water content at 23° C. and 50% relative humidity.
2 more elements
Dependencies are inferred from the claim text.