Photoimageable compositions having improved stripping ability and resolution

A negative-acting photoimageable composition developable in alkaline aqueous solution, said composition comprising:

• I) a binder polymer having an acid number of between about 150 and about 300;
• a weight average molecular weight between about 5000 and about 60,000, and said polymer being free of styrene or styrene homologues;
• II) an addition-polymerizable non-gaseous α,β-ethylenically unsaturated compound(s) capable of forming a high polymer by free-radical initiated chain-propagating addition polymerization;
• and,
• III) a radiation-sensitive free-radical generating photoinitiator chemical system activatable by actinic radiation to initiate chain-propagating addition polymerization of the addition-polymerizable material,
• wherein all or a portion of said component II) comprises a (meth)acrylate functional urethane oligomer having the formula:
• T—I—(—P′—I—)q—T
• where I at each independent occurrence is a radical of the formula:
• where R is a polyvalent aliphatic, cycloaliphatic, or aromatic hydrocarbon group;
• T at each independent occurrence is selected from a (meth)acrylate-functional organic radical of the formula:
• where
• R1 is a hydrogen atom or a methyl group, A, B and E are in the order given or in any order, A is an alkylene oxide group of the formula:
• —[—(CH2)n—O—]—, where n is an integer from 1 to 20, and x is an integer from 1 to 40, B is an alkylene oxide group of the formula:
• —[—(CH2)n1—O—]—, where n1 is an integer from 1 to 20, and y is an integer from 0 to 40 with the alkylene oxide group of B being different from that of A, and A plus B having from at least 2 alkylene oxide groups, and E is a ring-opened lactone group of the formula:
• where n2 is an integer from 1 to 20, and z is an integer from 1 to 40;
• P is of the formula:
• —[—O—G—]—
• where G is of the formula:
• —(A)s1—(B)s2—(E)s3—(D)f—(W)k—(J)u—(B)s4—(A)s5—
• where A, B, E and R are defined above, f, k, and u equal 0 or 1, D is an diester functional alkoxy radical of the formula:
• where t is an integer from 1 to 40, W is a radical of the formula:
• where V is an acidic group selected from —COOH, —SO3H, and PO3HR2 where R2 is a hydrogen atom or a C1-18 alkyl radical, J is an ester functional alkyl radical of the formula:
• where t1 is an integer from 1 to 6, and, with the proviso that if f+k+u=0, then Σs1 . . . s5 must be ≧1;
• and
• q is 0 or an integer from 1 to 10.

A negative-acting photoimageable composition developable in alkaline aqueous solution, said composition comprising:

• I) a binder polymer having an acid number of between about 150 and about 300;
• a weight average molecular weight between about 5000 and about 60,000, and said polymer being free of styrene or styrene homologues;
• II) an addition-polymerizable non-gaseous α,β-ethylenically unsaturated compound(s) capable of forming a high polymer by free-radical initiated chain-propagating addition polymerization;
• and,
• III) a radiation-sensitive free-radical generating photoinitiator chemical system activatable by actinic radiation to initiate chain-propagating addition polymerization of the addition-polymerizable material,
• wherein all or a portion of said component II) comprises a (meth)acrylate functional urethane oligomer having the formula:
• T—I—(—P′—I—)q—T
• where I at each independent occurrence is a radical of the formula:
• where R is a polyvalent aliphatic, cycloaliphatic, or aromatic hydrocarbon group;
• T at each independent occurrence is selected from a (meth)acrylate-functional organic radical of the formula:
• Where R1 is a hydrogen atom or a methyl group, A, B, and E are in the order given or in any order, A is an alkylene oxide group of the formula:
• —[—(CH2)n—O—]—, and x is an integer from 1 to 40, B is an alkylene oxide group of the formula:
• —[—(CH2)n1—O—]—, where n1 is an integer from 0 to 40 with the alkylene oxide group of B being different from that of A, and A plus B having at least 2 alkylene oxide groups, and E is a ring-opened lactone of the formula:
• where n2 is an integer from 1 to 20, or E is a ring-opened lactam group of the formula:
• where n2 is defined above and R2 is a hydrogen atom or a C1-18 alkyl radical, and z is an integer from 1 to 40, and m is an integer from 1 to 40, or E is a mixture of the ring-opened lactone and the ring-opened lactam;
• and P is of the formula:
• —[—O—G—]—
• where G is of the formula:
• —(A)s1—(B)s2—(E)s3—(D)f—(W)k—(J)u—(B)s4—(A)s5—
• where A, B, E, and R are defined above, and f, k, u are 0 or 1,
• D is an diester functional alkoxy radical of the formula:
• where t is an integer from 1 to 40, W is a radical of the formula:
• where V is an acidic group selected from —COOH, —SO3H, and PO3HR2 where R2 is a hydrogen atom or a C1-18 alkyl radical, J is an ester functional alkyl radical of the formula:
• where t1 is an integer from 1 to 6, and, with the proviso that if f+k+u=0, then Σs1 . . . s5 must be ≧1.

A negative-acting photoimageable composition developable in alkaline aqueous solution, said composition comprising:

• I) a binder polymer having an acid number of between about 150 and about 300;
• a weight average molecular weight between about 5000 and about 60,000, and said polymer being free of styrene or styrene homologues;
• II) an addition-polymerizable non-gaseous α,β-ethylenically unsaturated compound(s) capable of forming a high polymer by free-radical initiated chain-propagating addition polymerization;
• and
• III) a radiation-sensitive free-radical generating photoinitiator chemical system activatable by actinic radiation to initiate chain-propagating addition polymerization of the addition-polymerizable material, wherein all or a portion of said component II) comprises a (meth)acrylate functional urethane oligomer having a formula:
• and T is:
• H2C═C(CH3)CO—O—(—CH2—CH2—O—)x—(—CO—CH2—CH2—CH2—CH2—CH2—O—)z—
• Wherein x=5 or 6 and z=3, 4, or 6.