Abstract: A polymerizable acrylic composition comprises: (a) at least one acrylic monomer; (b) an effective amount of an organoborane amine complex having the structure: wherein: R1 is an alkyl group having 1 to 10 carbon atoms; R2 and R3 are independently selected from phenyl-containing groups and alkyl groups having 1 to 10 carbon atoms; R4 is selected from the group consisting of CH2CH2OH and (CH2)xNH2 wherein x is an integer greater than 2; R5 is hydrogen or an alkyl group having 1 to 10 carbon atoms; and the nitrogen atom to boron atom ratio is about 1:1 to 1.5:1; and (c) an effective amount of an acid for initiating polymerization of the acrylic monomer. The polymerizable acrylic compositions are especially useful for bonding low surface energy substrates.

Abstract: A polymerizable acrylic composition comprises: (a) at least one acrylic monomer; (b) an effective amount of an organoborane amine complex having the structure: wherein: R1 is an alkyl group having 1 to 10 carbon atoms; R2 and R3 are independently selected from phenyl-containing groups and alkyl groups having 1 to 10 carbon atoms; R4 is selected from the group consisting of CH2CH2OH and (CH2)xNH2 wherein x is an integer greater than 2; R5 is hydrogen or an alkyl group having 1 to 10 carbon atoms; and the nitrogen atom to boron atom ratio is about 1:1 to 1.5:1; and (c) an effective amount of an acid for initiating polymerization of the acrylic monomer. The polymerizable acrylic compositions are especially useful for bonding low surface energy substrates.

Abstract: A polymerizable acrylic composition comprises:(a) at least one acrylic monomer;(b) an effective amount of an organoborane amine complex having the structure: ##STR1## wherein: R.sup.1 is an alkyl group having 1 to 10 carbon atoms;R.sup.2 and R.sup.3 are independently selected from phenyl-containing groups and alkyl groups having 1 to 10 carbon atoms;Rhu 4 is selected from the group consisting of CH.sub.2 CH.sub.2 OH and (CH.sub.2).sub.x NH.sub.2 wherein x is an integer greater than 2;R.sup.5 is hydrogen or an alkyl group having 1 to 10 carbon atoms; andthe nitrogen atom to boron atom ratio is about 1:1 to 1.5:1; and(c) an effective amount of an acid for initiating polymerization of the acrylic monomer.The polymerizable acrylic compositions are especially useful for bonding low surface energy substrates.

Abstract: A polymerizable acrylic composition comprises:(a) at least one acrylic monomer;(b) an effective amount of an organoborane amine complex having the structure: ##STR1## wherein: R.sup.1 is an alkyl group having 1 to 10 carbon atoms;R.sup.2 and R.sup.3 are independently selected from phenyl-containing groups and alkyl groups having 1 to 10 carbon atoms;R.sup.4 is selected from the group consisting of CH.sub.2 CH.sub.2 OH and (CH.sub.2).sub.x NH.sub.2 wherein x is an integer greater than 2;R.sup.5 is hydrogen or an alkyl group having 1 to 10 carbon atoms; andthe nitrogen atom to boron atom ratio is about 1:1 to 1.5:1; and(c) an effective amount of an acid for initiating polymerization of the acrylic monomer.The polymerizable acrylic compositions are especially useful for bonding low surface energy substrates.

Abstract: A polymerizable acrylic composition comprises:(a) at least one acrylic monomer;(b) an effective amount of an organoborane amine complex having the structure: ##STR1## wherein: R.sup.1 is an alkyl group having 1 to 10 carbon atoms;R.sup.2 and R.sup.3 are independently selected from phenyl-containing groups and alkyl groups having 1 to 10 carbon atoms;R.sup.4 is selected from the group consisting of CH.sub.2 CH.sub.2 OH and (CH.sub.2).sub.x NH.sub.2 wherein x is an integer greater than 2;R.sup.5 is hydrogen or an alkyl group having 1 to 10 carbon atoms; andthe nitrogen atom to boron atom ratio is about 1:1 to 1.5:1; and(c) an effective amount of an acid for initiating polymerization of the acrylic monomer.The polymerizable acrylic compositions are especially useful for bonding low surface energy substrates.

Abstract: A hammer comprises a bed in the guides of which is mounted a frame, the latter being supported on cushions. The frame mounts a hammer head provided with a dirve for imparting thereto an axial reciprocating motion. The hammer head drive includes a power cylinder with a piston and a piston rod. The hammer head is located in a central hole provided in the piston rod and has a working tool which is attached to the lower end thereof and is situated above a die block.The stroke of the piston exceeds the distance between the die block and the lower end of the piston rod. With the piston in the lowermost position, the piston rod in conjunction with the surface of the die block forms a closed zone around the hammer head, in which zone deformation of the blank is effected. The hammer head is provided with a mechanism for retention thereof in the initial position. Provision is also made for a mechanism for lifting the hammer head into the initial position after a blow.