Optical contact objects

Claim 2

Optical contact objects fabricated from wettable, optionally crosslinked copolymers of olefinically unsaturated monomers, wherein the copolymer contains as components (A) 4 to 55 parts by weight of an N-vinylcarboxamide of the formula ##STR14## in which R 1 and R 2 are the same or different and denote hydrogen or lower alkyl, (B) 96 to 30 parts by weight of a (meth)acrylate of a polysiloxane, and, optionally (C) up to 66 parts by weight of a vinyl monomer.

Claim 3

Optical contact objects according to claim 1, wherein 5 to 15 parts by weight of the N-vinylcarboxamide are used.

Claim 4

Optical contact objects according to claims 1 and 2, wherein N-methyl-N-vinylacetamide is used as the N-vinylcarboxamide.

Claim 5

Optical contact objects according to claims 1 to 3, wherein 85 to 35 parts by weight of a (meth)acrylate of a polysiloxane are used.

Claim 6

Optical contact objects according to claims 1 to 4, wherein a (meth)acrylate of a polysiloxane of the formula ##STR15## wherein n represents a number from 1 to 4, R 1 denotes hydrogen or methyl, and R 4 , R 5 and R 6 are the same or different and denote alkoxyl, lower alkyl, cycloalkyl, aryl, trimethylsiloxyl or polysiloxane, is used.

Claim 7

Optical contact objects according to claims 1 to 4, wherein a (meth)acrylate of a polysiloxane of the formula ##STR16## wherein n and m are identical or different and each represent a number from 1 to 3, and R 3 denotes hydrogen or methyl and R 7 denotes lower alkyl, cycloalkyl or polysiloxane, is used.

Claim 8

Optical contact objects according to claims 1 to 4, wherein a (meth)acrylate of a polysiloxane of the formula ##STR17## wherein n represents a number from 1 to 4, R 3 denotes hydrogen or methyl, R 8 denotes hydrogen, lower akyl or hydroxyl, R 9 represents polysiloxane, X denotes oxygen, sulphur or the radical ##STR18## wherein R 8 has the meaning given above, and Y represents a divalent C 2 -tp C 24 -alkylene, C 5 - to C 8 -alkylene, or a divalent radical having 7 to 20 carbon atoms consisting of alkylene, cycloalkylene and/or arylene groups, is used.

Claim 9

Optical contact objects according to claims 1 to 4, wherein a (meth)acrylate of a polysiloxane of the formula ##STR19## wherein n represents a number from 1 to 6, R 3 denotes hydrogen or methyl, R 9 represents siloxane, and R 10 denotes hydrogen, lower alkyl or cycloalkyl, is used.

Claim 10

Optical contact objects according to claims 1 to 8, wherein 10 to 60 parts by weight of a vinyl monomer are used.

Claim 11

Optical contact objects according to claims 1 to 9, wherein an N-vinyllactam and/or a (meth)acrylic acid derivative is used as the vinyl monomer.

Claim 12

Process for the preparation of optical contact objects, wherein (A) 4 to 55 parts by weight of an N-vinylcarboxamide of the formula ##STR20## wherein R 1 and R 2 are the same or different and denote hydrogen or lower alkyl, (B) 96 to 30 parts by weight of a (meth)acrylate or (meth)acrylates of a polysiloxane, and optionally, (C) up to 66 parts by weight of a vinyl monomer are polymerized in the presence of a radical initiator.

Claim 13

Process for the preparation of optical contact objects, wherein (A) 4 to 55 parts by weight of an N-vinylcarboxamide of the formula ##STR20## wherein R 1 and R 2 are the same or different and denote hydrogen or lower alkyl, (B) 96 to 30 parts by weight of a (meth)acrylate or (meth)acrylates of a polysiloxane, and optionally, (C) up to 66 parts by weight of a vinyl monomer are polymerized in the presence of a radical initiator.

Claim 14

Use of wettable, optionally crosslinked copolymers containing as components (A) 4 to 55 parts by weight of an N-vinylcarboxamide of the formula ##STR21## wherein R 1 and R 2 are the same or different and denote hydrogen or lower alkyl, (B) 96 to 30 parts by weight of a (meth)acrylate or (meth)acrylates of a polysiloxane, and, optionally, (C) up to 66 parts by weight of a vinyl monomer for optical contact objects.

Claim 15

Use of wettable, optionally crosslinked copolymers containing as components (A) 4 to 55 parts by weight of an N-vinylcarboxamide of the formula ##STR21## wherein R 1 and R 2 are the same or different and denote hydrogen or lower alkyl, (B) 96 to 30 parts by weight of a (meth)acrylate or (meth)acrylates of a polysiloxane, and, optionally, (C) up to 66 parts by weight of a vinyl monomer for optical contact objects.

Claim 16

Use according to claim 12 for contact lenses or scleral lenses.