New fiber products
AssigneeBASF SE
InventorAdolf Käser
Life of this patent
Estimating the term…
Abstract
Fiber products, comprising in their body at least 20% by weight of cellulose fibers, and adequate amounts of an acid and a cationic retention aid for the acid, can be marked by means of a laser beam.
Claims20
A process for preparing a marked fiber product comprising at least 20% by weight of cellulose fibers, based on the weight of the anhydrous fiber product, comprising the steps of
- i) incorporating adequate amounts of
- a) at least one acid,
- b) at least one cationic retention aid for the acid, and
- c) if desired, further additives
- into the body of the fiber product, and
- ii) exposing those parts of the resulting fiber product, where a marking is intended, to energy by means of a laser beam.
(canceled)
A fiber product comprising at least 20% by weight of cellulose fibers, based on the weight of the anhydrous fiber product, comprising in its body an adequate amount of at least one acid, between 1 and 2.8% by weight based on 100% anhydrous fiber substrate of a cationic retention aid for the acid, and if desired, further additives.
A fiber product comprising at least 20% by weight of cellulose fibers, based on the weight of the anhydrous fiber product, comprising in its body adequate amounts of at least one acid, a cationic retention aid for the acid, and if desired, further additives, with the proviso that
- i) said retention aid is different from a branched polyethyleneimine which contains primary, secondary or tertiary amino groups and which has a weight average molecular weight in the range from 5000 to 1500000, and in which the numerical ratio of secondary amino groups to primary amino groups is in the range from 1.00:1 to 2.50:1 and the numerical ratio of secondary amino groups to tertiary amino groups is in the range from 1.20:1 to 2.00:1, or
- ii) said acid does not have or carry the functional group —PO(OH)2 directly bonded to a carbon atom of the acid.
Dependencies are inferred from the claim text.