|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||B32B-005/16 B32B-029/00 D21H-011/00|
|미국특허분류(USC)||428/402; 428/537.7; 162/135; 162/181.1; 162/181.2|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 2 인용 특허 : 27|
The present invention relates to the use of calcium oxalate as a filler or pigment. In particular described herein is a method of reducing the combustion residue of coated paper or cardboard products by replacing at least a part of the conventional pigments and filler needed for achieving predetermined optical properties with calcium oxalate.
1. Coated, wood-free paper comprising a pigment comprising calcium oxalate, wherein said coated, wood-free paper has an ISO brightness of over 80% and an opacity of over 80%, wherein said calcium oxalate is a monohydrate that has been ground and over 90% of the particles of said ground calcium oxalate that are used are smaller than 2.3 gm and only 10% are smaller than 0.5 um.2. The coated, wood-free paper according to claim 1, wherein said paper further comprises a filler that comprises calcium oxalate.3. The coated, wood-free paper according to claim 1 ...