Abstract: The use of a photopolymerizable composition containing a phenol formaldehyde resin, a curing agent, and a photoinitiator in a generative manufacturing method for producing three-dimensional objects by irradiating it layer by layer to cure the composition is described. The use involves the following steps: a) the composition is heated to a reaction temperature of at least 70° C. before and during curing; b) the composition contains: b1) a novolak as said phenol formaldehyde resin, b2) a formaldehyde derivative stable at the reaction temperature as said curing agent, and b3) a photoacid generator as said photoinitiator; and c) curing of the composition is conducted at normal pressure; with the proviso that the curing agent is not an amine-containing formaldehyde derivative.

Abstract: A thermoplastic poly(urethane-urea) polyadduct (I) with sterically hindered urea groups used in an electrospinning method for producing vascular prostheses: I, M, C1 and C2 represent bivalent radicals linked via a urethane or urea moiety; I and C2 represent a bivalent, saturated or unsaturated, aliphatic, alicyclic or aromatic radical with 1-20 carbon atoms derived from (I): a diisocyanate; or (C2): from a diol, diamine or amino alcohol; M represents a bivalent radical of an aliphatic polyether, polyester or polycarbonate derived from a macrodiol having Mn?500; C1 represents a bivalent, saturated or unsaturated, aliphatic or alicyclic radical with 1-30 carbon atoms derived from a diamine or amino alcohol with ?1 sterically hindered secondary amino group through removal of one N-linked hydrogen atom of the diamine or one N-linked and the O-linked hydrogen atoms of the amino alcohol.

Abstract: A thermoplastic poly(urethane-urea) polyadduct with sterically hindered urea groups of the following Formula (I): —[I-M-(I—C1)a—(I-M)b-(I—C2)c]n-??(I) I, M, C1 and C2 each representing bivalent residues linked to each other via a urethane or urea moiety. In the residues I, C1 and C2, when more than four carbon atoms are present, optionally at least one of them is substituted by a heteroatom selected from oxygen and nitrogen. Optionally at least one of the residues I, M, C1 and C2 includes one or more ester moieties. a, b and c each independently represent an integer from 0 to 10, and n is a number ?3 representing the number of blocks in the polyadduct. Within each separate block a+c?1, and in all blocks together at least one a?1 and at least one c?1.