Title: Slow release biologically active materials for feeding to ruminant animals

Abstract: Biologically active compositions suitable for feeding to a ruminant animal containing a biologically active material coated with or in a matrix of a polymeric material having amide repeat units of the structure --NR.sub.1 --A--NR.sub.1 --CO--B--CO-- (I) wherein the groups R.sub.1, which may be the same or different, are hydrogen alkyl or substituted alkyl groups, and A and B are divalent groups one or both of which includes the group ##STR1## wherein the groups R.sub.2, which may be the same or different, are hydrogen alkyl or substituted alkyl groups the proportion of nitrogen in the polymeric material derived from the amino groups in II being in the range of from 2% to 10% by weight of the polymeric material.

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Inventors: Fildes, Francis James Thomas (Runcorn, EN)

Application Number: 508715
Filing Date: 1974-09-23
Publication_date: 1977-01-04
Assignee: Imperial Chemical Industries Limited (London, EN)
Primary Class(es): 424/438 424/482
Other Classes:
US Patent Ref:

3492398	Jan, 1970	Marco et al.	424/32.
3880990	Apr, 1975	Bauer	424/19.

Other Refs:
Primary Examiner: Rosen, Sam
Assistant Examiner:
Attorney: Cushman, Darby & Cushman