Abstract: Apparatus for removing an outer layer, or covering, such as of shingles from a flat surface such as a roof includes a frame with an elongated, linear cutting blade attached to a lower, forward portion thereof and adapted for displacement along and in contact with the roof. The apparatus further includes a blade drive arrangement for displacing the blade in a reciprocating manner along its length and parallel to the roof. Also attached to a forward portion of the frame immediately above the blade is a concave, upward extending deflector for directing the removed shingles forward of the apparatus as it is displaced over the roof. A handle extends from the frame to facilitate manual displacement of the apparatus over the roof as the roofing nails, or other attachment means, are served by the blade in removing the shingles from the roof.

Abstract: High temperature resistant pressboard having a density of 0.70 to 0.90 g/cc, a calculated void volume of 31 to 49, percent by volume of said pressboard and a smoothness of 80 to 250 microinches MD range and 90 to 260 microinches is disclosed. The pressboard is prepared by wet laying an aqueous dispersion of polyaramid fibrids and floc to form a waterleaf building up layers to form a wet lap which is dried and then pressed at 270.degree. C. to 520.degree. C. rising a press with a predetermined minimum opening to form the desired smooth low density pressboard.

Abstract: Polyaramide gas separation membranes and the process of using them are disclosed.

Abstract: Thermoprocessible aramid matrix polymer based composites have high flex and short beam shear strengths and low moisture uptake.

Abstract: A novel nucleic acid containing an arabinonucleic acid segment is provided as a probe in nucleic acid assays. The arabinose moiety of the probe can be detected with anti-arabinose antibody-label conjugates.

Abstract: Liquid phase chlorination in an evaporatively cooled reactor of 1,3-butadiene to 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 by contacting 1,3-butadiene and elemental chlorine in a solvent at a temperature of 25.degree.-100.degree. C. said solvent being butane or pentane or a fluorinated solvent of the formula (CR.sub.3)(CR'.sub.2).sub.m (CR".sub.2).sub.n R where R is independently hydrogen, fluorine, chlorine or bromine, R' is hydrogen, R" is independently fluorine, chlorine or bromine, m and n are 0-3 with the proviso that terminal carbon atoms are independently perhalogenated or fully hydrogenated, the solvents boil at -15.degree. C. to 40.degree. C. at atmospheric pressure, and the solvent to dichlorobutene ratio is from 2.0:1 to 11:1. The heat of reaction is removed by vaporization of solvent and 1,3-butadiene and returning the ingredients to the reactor.

Abstract: A process for the hydrocarboxylation of alkenes and non-conjugated olefinically unsaturated nitriles and esters using a rhodium catalyst, a bromide or iodide promoter, and a nitrile accelerator.

Abstract: Compounds having the formula ##STR1## and pharmaceutically acceptable salts thereof, wherein R.sub.3 and R.sub.4 are the same or different and each is hydrogen or alkyl or R.sub.3 and R.sub.4 taken together with the nitrogen atoms to which they are attached form a 1,2-diazacyclobutane, 1,2-diazacyclopentane, 1,2-diazacyclohexane, or 1,2-diazacycloheptane ring and Y, and Y.sub.2 are either hydrogen or hydroxy but are not the same; are useful chemical intermediates for the preparation of .beta.-lactam antibiotics.

Abstract: A method of shaping elongated composite structures of a resin matrix reinforced with randomly broken fibers oriented in transverse and non-transverse directions with respect to the longitudinal axis of the structure is implemented by a computer aided apparatus for forming the structure. The apparatus is provided with a heated fixed forming tool, a means for stretching the structure from each end and means associated with the forming tool for separately holding each formed component length of the structure in place against the forming tool. The formed structure is characterized by the particular orientation of the fibers in the transverse and non-transverse direction after the structure is formed.

Abstract: A low cure cathodic electrodepositable resin is disclosed. The backbone of the resin is a polyepoxide amine adduct having primary or secondary hydroxyl groups which is crosslinked with aminoplast resins and catalyzed by metal catalysts. The resin is capable of curing in a basic environment at a temperature below 150.degree. C. The resin can be salted with an acid and can be dissolved or dispersed in water. The aqueous dispersions can then be formulated into electrocoat primer coatings for metal objects.

Abstract: A process is provided for the production of a novel melt-processible aromatic polyamide having a Tg >150.degree. C.

Abstract: A process for the preparation of 1,3-disubstituted imidazolium salts that comprises reaction of an .alpha.-dicarbonyl compound, an aldehyde, an amine and an acid is disclosed.

Abstract: The present invention concerns a plasticized polyvinyl alcohol release composition for an aqueous or semi-aqueous processible flexographic printing plate comprising:(a) at least 60% of a substantially hydrolyzed polyvinyl alcohol based on the total weight of the release composition; and(b) at least 8% plasticizer, based on the total weight of the release composition.This invention also concerns aqueous or semi-aqueous processible flexographic photosensitive elements containing this plasticized polyvinyl alcohol release layer and to processes for making printing reliefs from such elements.

Abstract: An element comprising a support having an antistatic layer applied to one side thereof and wherein said antistatic layer also contains antihalation dyes absorbing light at 440 nm and below and with matte particles therein, is described. A photosensitive layer, e.g., photographic silver halide layer can be coated on the opposite side of the support. The element exhibits excellent antistatic and antihalation properties as well as low dye stain and improved dimensional stability, compared to elements wherein the antihalation dyes are coated in a separate layer. These products are especially useful as so-called "bright-light films" that are designed for contact printing and the like.

Abstract: Staple yarns of cotton and high modulus fiber are wet and then dried under tension to provide warp yarn for durable, abrasion resistant fabrics.

Abstract: This invention relates to positive working resist compositions having utility in dry film photoresists and to fully aqueous methods for developing and stripping them.

Abstract: Melt-processible copolymers of at least two halogenated comonomers from a defined class, especially perhalogenated comonomers, and particularly perfluorinated comonomers, of improved thermal stability are obtained by first contacting the copolymers with a stabilizing agent selected from bases (ammonia or amines) having a boiling point at normal pressure of at most 130.degree. C. and tertiary alcohols having up to 8 carbon atoms, to form an intermediate, drying the intermediate at about 70.degree.-150.degree. C., and fluorinating the intermediate at a temperature between 20.degree. C. and the lowest temperature at which the copolymer exhibits a solid state transistion, then removing excess fluorine and by-products and recovering the stabilized copolymer. Such stabilized copolymers are useful for a variety of technically important applications, including as cladding for optical fibers, substrates for electronic components, thermal laminates, pipes, tubes, and fittings, etc.

Abstract: The present invention relates to a process for producing degradable, shrinkable films of polyhydroxy acid and plasticizers including melt processing the materials to obtain uniform composition, forming the composition into a film, and biaxially orienting the film. Also, non-shrinkable films are produced by heat-setting the biaxially oriented films at temperature above the composition glass transition temperature and below its melt temperature while maintaining the film under restraint. Films thus produced are useful for disposable, environmentally benign packaging and other conventional film uses.

Abstract: Mixtures of the two fluorocarbon compounds 1,1,2,2,3,5,5,5-nonafluoro-4-trifluoromethylpentane and 1,1,1,2,2,5,5,5-octafluoro-4-trifluoromethylpentane with alcohols, ethers, esters, ketones, nitrogen-containing organic compounds, and halogenated hydrocarbons are disclosed; as is a process for cleaning a solid surface which comprises treating the surface with said mixtures. Ternary mixtures of about 88 to 96 weight percent total of said two fluorocarbon compounds with methanol (including at least about 11 weight percent 1,1,1,2,2,3,5,5,5-nonafluoro-4-trifluoromethylpentane and at least about 13 weight percent 1,1,1,2,2,5,5,5-octafluoro-4-trifluoromethylpentane) and with ethanol (including at least about 28 weight percent 1,1,1,2,2,3,5,5,5-nonafluoro-4-triluoformethylpentane and at least about 16 weight percent 1,1,1,2,2,5,5,5-octafluoro-4-trifluoromethyl-pentane) are disclosed as quasiazeotrope compositions that are useful where recovery and reuse of solvents is practiced.

Abstract: A polyamide yarn is disclosed which is at least 85% by weight poly(hexamethylene adipamide) and which has a relative viscosity of greater than 50, a tenacity of at least about 9.5 g/d, a modulus of at least about 30 g/d, a shrinkage at 160.degree. C. of less than about 2 percent, a crystal perfection index of greater than about 83, and a long period spacing of greater than about 105 .ANG.. The process for making the yarn includes drawing of a feed yarn while heating to at least about 190.degree. C. in at least a final draw stage to a draw tension of at least 3.8 g/d, subsequently decreasing the tension while heating to at least about 190.degree. C. to produce a length decrease of between about 13.5 and about 30%, and cooling and packaging the yarn.