摘要:
Disclosed are methods of producing super-absorbing polymeric networks of polyaspartates from crosslinked polysuccinimide. In one preferred aspect, polysuccinimide is first reacted with an organic crosslinking agent, preferably an organic base containing at least two primary amine groups, to form a gelled crosslinked polysuccinimide. The gelled crosslinked polysuccinimide is then base hydrolyzed to a gelled polymeric network of polyaspartate and deswollen with at least one liquid alcohol to a polymeric network of polyaspartate which demonstrates super-absorbing capability in water and in electrolyte solution. Super-absorbing polymeric networks of polyaspartates can also be produced in a single reaction vessel by sequentially crosslinking a polysuccinimide with an organic crosslinking agent in an aqueous reaction medium, optionally containing a mineral acid, and then hydrolyzing the crosslinked polysuccinimide to produce a polymeric network of polyaspartate.
摘要:
This invention relates to enhancing plant productivity employing a method and improved compositions containing water-soluble crosslinked polyamino acids having a weight average molecular weight of a size larger than about 1,500. More particularly, crosslinked polyamino acids enhance plant productivity when supplied to the plant directly as the free acid or salt thereof or hydrolyzed from a crosslinked precursor of the crosslinked polyamino acid by the method disclosed. Particularly suitable for this purpose are water-soluble, crosslinked polyaspartic acid, and salts thereof and hydrolyzed crosslinked polysuccinimide.
摘要:
A localized fiber reinforcement places strong tensile strength fibers across a hypothetical split line near notches in beams to curtail split propagation caused by cross-grain tension that may otherwise significantly reduce the strength of a beam used as a spanning member. An adhesive coated patch may be applied after a notch is cut in the beam or fibers may be attached to a beam at a factory near the location of an anticipated notching.
摘要:
Seedling development is enhanced by applying to the seeds, for example corn and soybeans, a water-soluble, non-aromatic polyamino acid such as polyaspartic acid. Time to germination is decreased, and rate of seedling development is increased. The composition may be applied to the seeds with a liquid or solid carrier or in combination with other seed treatments, such as nutrients and pesticides.
摘要:
A wooden panel door reinforced against attempted break-in contains layers of fiberglass mat and decorative wooden facing strip bonded to the doorjamb and stiles. The stiles and doorjamb are constructed from wood with grain that runs primarily in a single direction, and reinforcing these stiles and doorjambs against impact can be achieved by bonding to them a fiberglass mat, which contains fibers running in transverse directions. The fiberglass mat is in turn covered by a decorative wooden facing strip layer.
摘要:
A reinforced structural member, a process for manufacturing the reinforced structural member, and a method of connecting the reinforced structural members to one another are presented. The reinforced structural member includes a reinforcing material which is bonded to a wooden substrate in areas of anticipated connection of the reinforced structural member. The reinforcing material may comprise a fiberglass sheet, a wood laminate sheet, a coating of epoxy resin, or a combination of any of the foregoing.
摘要:
A check processing module (CPM) is provided for a self-service check depositing terminal. The CPM comprises a substantially U-shaped plastic guide including (i) first and second leg portions forming the substantially U-shape, (ii) a surface which forms an opening in the first leg portion, and (ii) a releasing member which is disposed on the second leg portion. The CPM further comprises a shaft assembly including (i) a plastic shaft having opposite end portions and a central portion between the opposite end portions, (ii) a number of drive rollers disposed on the central portion, (iii) a first plastic race bearing attached to one end portion of the plastic shaft and disposed in the opening of the plastic guide, and (iv) a second plastic race bearing attached to the other end portion of the plastic shaft and secured by the releasing member to the plastic guide. The releasing member is operable to secure the shaft assembly to the plastic guide during operation of the CPM, and is operable to release the shaft assembly from the plastic guide during disassembly of parts of the CPM.
摘要:
Ultrasonic techniques are applied to the measurement of wooden members to detect splitting during sawing operations and thereby allow modification of sawing technique or change in saw cut placement.
摘要:
Plant productivity in a hydroponic medium is enhanced by the addition of a water-soluble, non-biodegradable, non-peptidal polymeric acid having a molecular size larger than about 1,500 Daltons.
摘要:
This invention relates to enhancing plant productivity employing a method and improved compositions containing water-soluble amino acid co-polymers having a molecular size larger than about 1,500 Daltons.