Promoting Degradability Of Polymers Patents (Class 260/DIG43)
  • Patent number: 6004428
    Abstract: A process for dissolving a binder off a fiber web bonded therewith includes treating the fiber web, which is bonded with a polymeric binder having carboxylate groups crosslinked via alkaline earth metal cations, with an aqueous solution of an alkali metal salt to form a sparingly soluble salt or complex between the anion of the alkali metal salt and the alkaline earth metal cations, and then removing the fiber freed of the binder.
    Type: Grant
    Filed: May 6, 1997
    Date of Patent: December 21, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl-Heinz Schumacher, Rainer Hummerich, Howard Peter Kirsch
  • Patent number: 5395692
    Abstract: This invention relates to a polyester comprising repeating units having the structure: ##STR1## wherein R.sup.1 is selected from the group consisting of hydrogen, alkyl having 1 to 6 carbon atoms and aryl having 6 to 10 carbon atoms and R.sup.2 is selected from the group consisting of hydrogen, alkyl having 1 to 6 carbon atoms, and aryl having 6 to 10 carbon atoms.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: March 7, 1995
    Assignee: Eastman Chemical Company
    Inventors: Alan W. White, Joseph R. Zoeller
  • Patent number: 5336457
    Abstract: Compostable polymeric sheets of biodegradable or environmentally degradable polymers are included. These composite sheets may be made by extrusion and are compostable in municipal solid waste treatment facilities.The composite film is formed by coextrusion of top and bottom water insoluble thermoplastic films having a water soluble polymer therebetween and stretching the composite along line space substantially uniformally across and through the depth of the composite for weakening the strength of the composite while maintaining its water impermeability.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: August 9, 1994
    Assignee: Clopay Plastic Products Company, Inc.
    Inventors: Pai-Chuan Wu, Thomas R. Ryle, Leopoldo V. Cancio
  • Patent number: 5187249
    Abstract: Photodegradable polymers comprising B-alkoxy substituted vinyl ketone functionality and thermoplastic articles formed therefrom.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: February 16, 1993
    Assignee: The Dow Chemical Company
    Inventors: Virginia A. Dais, Duane B. Priddy
  • Patent number: 5133909
    Abstract: A biologically degradable film is prepared consisting of a synthetic polymer and a biologically degradable polymer. The biologically degradable polymer is divided into small particles in an aqueous suspension by means of enzymes that split and release small molecules from the surface of the biopolymer particles. After achieving desired particle size, an emulsion is formed with vegetable oil and the particles coated with enzyme protein become coated with vegetable oil, which at the same time interrupts the degradation of the biopolymer particles by the enzyme. The coated particles with the oil are separated from the suspension to remove small molecules after which the particles are re-dried and then pulverized. The final film is prepared in a film extruder in which the biopolymer is mixed with the synthetic polymer and possibly other additives that are generally used informing polymer films.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: July 28, 1992
    Assignee: Biodata Oy
    Inventor: Hannu L. Suominen
  • Patent number: 4839450
    Abstract: Moisture-shrinkable films can be extrusion blown from modified starch-poly(methyl acrylate) graft compolymers. The films shrink when exposed at room temperature to relative humidities approaching 100%. The films have potential application in shrink-wrapping irregularly shaped articles without application of heat; they are easily removed by water washing.
    Type: Grant
    Filed: November 17, 1987
    Date of Patent: June 13, 1989
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: George F. Fanta, Felix H. Otey
  • Patent number: 4778857
    Abstract: Uncured rubber compositions containing fused aromatic furazan oxides exhibit improved processability and reduced viscosity. Useful furazan oxides have both carbons of the furazan ring as part of a fused aromatic ring and include benzofurazan oxide and its methyl and methoxy analogs. Improvements in processability, green strength and liquification of NR can be achieved through use of these furazan oxides in uncured rubber compositions.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: October 18, 1988
    Assignee: The Firestone Tire & Rubber Company
    Inventors: Daniel F. Graves, Walter R. Hausch
  • Patent number: 4709808
    Abstract: A group of degradable polymer compositions including admixtures of ethylene-carbon monoxide copolymer with defined proportions of high density polyethylene, linear low density polyethylene or polypropylene is disclosed. The compositions are useful for forming article carriers, containers, closures, foodtrays and the like, which show excellent mechanical and structural properties and controlled environmental degradability.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: December 1, 1987
    Assignee: Owens-Illinois Plastic Products Inc.
    Inventors: Dennis C. Balduff, Saleh A. Jabarin
  • Patent number: 4601896
    Abstract: This invention provides oral dosage forms of therapeutic agents such as digestive enzymes which are subject to degradation and loss of activity at gastric pH. and compositions and methods for preparing same. Capsules of their components are formulated from a composition comprising a plastic homogeneous mass of gastric fluid impervious material such as cellulosic derivatives or collagenous material; from 10-65% by weight of a diluent selected from the group consisting of water, a lipid having a melting point above mammalian body temperature and a water miscible solvent; 4-60% by weight of procollagen; and 30-86% by weight of collagen or elastin. The composition is formed into finished capsules of relatively homogeneous composition comprising 10-50% by weight of procollagen and 40-96% by weight of a material selected from the group consisting of collagen and elastin, and having less than 4% by weight of fat and water-soluble protein.
    Type: Grant
    Filed: March 21, 1984
    Date of Patent: July 22, 1986
    Inventor: Mark Nugent
  • Patent number: 4482701
    Abstract: Preparation of hydrolyzable polyester resin comprising reacting polycarboxylic acid and polyhydric alcohol components, which is characterized by using, as at least part of said polyhydric alcohol component, a metallic salt of hydroxy carboxylic acid of the formula defined and effecting the polycondensation at a temperature which is no more than the decomposition temperature of said metallic salt. The polyester resins are useful as resinous vehicle of varnishes and antifouling paints.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: November 13, 1984
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Naoki Yamamori, Junji Yokoi, Motoyoshi Yoshikawa
  • Patent number: 4337181
    Abstract: Film-forming formulations comprising starch, ethylene acrylic acid copolymer, and optionally polyethylene, can be blown into films upon neutralization of a portion of the copolymer acid functionality. The resultant biodegradable films have potential application as agricultural mulch, garbage bags, and various types of packaging.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: June 29, 1982
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Felix H. Otey, Richard P. Westhoff
  • Patent number: 4282076
    Abstract: A process for preparing an environmentally stable plastic composition having narrow molecular weight distribution by visbreaking a propylene polymer using an activated portion of the propylene polymer as a prodegradant. The process includes forming the prodegradant by activating a portion of the propylene polymer either by exposure to ionizing radiation or by oxidation.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: August 4, 1981
    Assignee: Hercules Incorporated
    Inventor: Donald E. Boynton
  • Patent number: 4272417
    Abstract: A stable, liquid seed coating composition is provided, including a binding agent, an active ingredient and a coloring agent in a liquid medium including water and a polyol.
    Type: Grant
    Filed: May 22, 1979
    Date of Patent: June 9, 1981
    Assignee: Cargill, Incorporated
    Inventors: Martin B. Barke, Rebecca A. Luebke
  • Patent number: 4256851
    Abstract: There is disclosed an environmentally degradable plastic composition comprising an organic polymeric material having dispersed therein at least one ethylenically unsaturated alcohol or ethylenically unsaturated ester derived therefrom as a readily autoxidizable organic substance.
    Type: Grant
    Filed: January 19, 1978
    Date of Patent: March 17, 1981
    Assignee: Owens-Illinois, Inc.
    Inventors: Lynn J. Taylor, John W. Tobias
  • Patent number: 4224416
    Abstract: There is disclosed an environmentally degradable plastic composition comprising an organic polymeric material having dispersed therein at least one amine compound as a readily autoxidizable organic substance.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: September 23, 1980
    Assignee: Owens-Illinois, Inc.
    Inventors: Lynn J. Taylor, John W. Tobias
  • Patent number: 4212955
    Abstract: There is disclosed an environmentally degradable plastic composition comprising an organic polymeric material having dispersed therein at least one trialkyl ortho ester as a readily autoxidizable organic substance.
    Type: Grant
    Filed: January 19, 1978
    Date of Patent: July 15, 1980
    Assignee: Owens-Illinois, Inc.
    Inventors: John W. Tobias, Lynn J. Taylor
  • Patent number: 4207221
    Abstract: There is disclosed an environmentally degradable plastic composition comprising an organic polymeric material having dispersed therein at least one unsaturated wax as a readily autoxidizable organic substance.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: June 10, 1980
    Assignee: Owens-Illinois, Inc.
    Inventors: John W. Tobias, Lynn J. Taylor
  • Patent number: 4197375
    Abstract: Plastic polyolefins which are resistant to photodegradation are combined with polyisobutylene to improve photodegradability.
    Type: Grant
    Filed: December 13, 1978
    Date of Patent: April 8, 1980
    Assignee: Chevron Research Company
    Inventor: Richard C. Fox
  • Patent number: 4191320
    Abstract: There is disclosed a degradable article made from photodegradable polymeric or plastic compositions comprising at least one organic polymer or copolymer and at least two different aromatic carbonyl photosensitizers.
    Type: Grant
    Filed: September 27, 1977
    Date of Patent: March 4, 1980
    Assignee: Owens-Illinois, Inc.
    Inventors: Lynn J. Taylor, John W. Tobias
  • Patent number: 4176145
    Abstract: Polymer compositions which have accelerated rates of degradation on exposure to ultraviolet radiation, e.g. direct sunlight in an outdoor environment, comprise a blend of a major proportion of a normal, standard synthetic polymer, e.g. polyethylene, and a minor proportion of a graft or block copolymer of a ketone group containing monomer, e.g. methyl vinyl ketone, graft or block copolymerized onto a backbone polymer e.g. of polyethylene. The composition can be molded, extruded and otherwise fabricated in the normal way to produce disposable, photodegradable plastic articles such as containers, wrapping films and the like.
    Type: Grant
    Filed: February 1, 1977
    Date of Patent: November 27, 1979
    Inventor: James E. Guillet
  • Patent number: 4156666
    Abstract: A degradable synthetic resin composition comprising a polyolefin, about 0.2 to 10% by weight of an organic degradation promotor and, optionally, about 10 to 60% by weight of an inorganic filler, and films for use in the agricultural environment prepared therefrom.
    Type: Grant
    Filed: October 31, 1975
    Date of Patent: May 29, 1979
    Assignee: Shiseido Company, Ltd.
    Inventors: Ryoji Odate, Yuuichi Miyahara
  • Patent number: 4144153
    Abstract: A process for producing a photodegradable rubber foamed products of excellent softness, which comprises mixing 1,2-polybutadiene with 0.1 to 3.0% of a photosensitizer and with a thermally decomposable foaming agent, irradiating with ultraviolet ray of a wavelength of 240 to 400 m.mu. for 10 minutes or less to form a cross-linked material having a gel fraction of 30 to 80% (in boiling toluene; 7 hours), and heating to 150 to 230.degree. C. to form a foamed product. In particularly preferred embodiments of this invention, the foaming agent is p,p'-oxybis (benzenesulfonylhydrazide).
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: March 13, 1979
    Assignee: Takiron Co., Ltd.
    Inventors: Yasuo Shikinami, Ryuichi Kimura, Yoshinobu Yoshikawa, Kosuke Iida, Kunihiro Hata
  • Patent number: 4125495
    Abstract: A biodegradable composition contains a high proportion, i.e., over 50% of biodegradable starch. The composition is particularly useful for making trays for holding meat. These trays are liquid repellant but gas permeable.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: November 14, 1978
    Assignee: Coloroll Limited
    Inventor: Gerald J. L. Griffin
  • Patent number: 4121025
    Abstract: The invention provides means for controlling the degradation of vinyl polymers by incorporating therein at least one non-ionic organo-soluble complex of a metal having an atomic number from 22 to 29, 40 to 47 or 57 to 79, the complex being activatable by light and optionally heat to give a more photo-oxidatively active form of the said metal, in an amount such as to cause degradation of the polymer at the end of the desired life of the composition.
    Type: Grant
    Filed: July 20, 1971
    Date of Patent: October 17, 1978
    Inventor: Gerald Scott
  • Patent number: 4101720
    Abstract: There is disclosed a novel degradable plastic composition consisting of an organic polymeric material, said material having dispersed therein at least one organic derivative of a transition metal and at least one readily autoxidizable organic material.
    Type: Grant
    Filed: January 2, 1976
    Date of Patent: July 18, 1978
    Assignee: Owens-Illinois, Inc.
    Inventors: Lynn J. Taylor, John W. Tobias
  • Patent number: 4100334
    Abstract: Polymers of the type commonly used in packaging are rendered degradable through the action of sunlight by adding thereto up to 3% of an olefinically unsaturated compound containing at least two double bonds, such as 1,6-diphenylhexatriene.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: July 11, 1978
    Assignee: Snam Progetti S.p.A.
    Inventors: Nicola Palladino, Marcello Mazzei, Walter Marconi
  • Patent number: 4076655
    Abstract: Polystyrene compositions, including polystyrene film and foamed polystyrene, containing as a photodegradability enhancing agent an organic carbonyl-containing compound, preferably benzoin; and such compositions containing in addition to said agent, a pro-oxidant metal salt or an acetylacetonate thereby imparting markedly enhanced photodegradability characteristics to said compositions.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: February 28, 1978
    Assignee: Mobil Oil Corporation
    Inventor: Arne O. Finberg
  • Patent number: 4073764
    Abstract: A plastic composition degradable under the influence of weather or light, comprising a plastic material and finely divided titanium dioxide with a specific surface of more than about 20 m.sup.2 /g. Preferably the titanium dioxide is obtained by hydrolyzing titanium sulfate in aqueous solution, has a predominantly anatase structure, a lightening power of less than about 400, a specific surface of about 60 to 400 m.sup.2 /g and is present in about 0.5 to 5% by weight of the composition, and the plastic material is selected from the group consisting of polyethylene, ethylene-vinyl acetate copolymer, polystyrene, polyvinyl chloride, polyamides and ABS-polymers.
    Type: Grant
    Filed: July 18, 1975
    Date of Patent: February 14, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz-Peter Hemmerich, Gerhard Winter, Hans J. Rosenkranz, Peter Woditsch
  • Patent number: 4067836
    Abstract: An environmentally degradable polymer based composition which has been exposed to actinic or ionizing radiation and which comprises an ethylene polymer base resin, and a synergistic combination of an auto-oxidative polymer or low molecular weight organic compound, certain polyvalent metal salts, and an antioxidant additive for the ethylene polymer; and a process for making such composition.
    Type: Grant
    Filed: August 20, 1975
    Date of Patent: January 10, 1978
    Assignee: Union Carbide Corporation
    Inventors: James Edward Potts, Stephen Watson Cornell, Albert Martin Sracic
  • Patent number: 4056665
    Abstract: There are disclosed novel photodegradable polymeric or plastic compositions comprising at least one organic polymer or copolymer and at least two different aromatic carbonyl photosensitizers.
    Type: Grant
    Filed: May 24, 1974
    Date of Patent: November 1, 1977
    Assignee: Owens-Illinois, Inc.
    Inventors: Lynn J. Taylor, John W. Tobias
  • Patent number: 4056499
    Abstract: There is disclosed the preparation of a gradable polymeric composition by the chemical modification of a polymeric material such as a polymer or copolymer. The preparation comprises reacting in the presence of free radicals the polymeric material with a non-polymeric organic reagent having a structure which contains both a hydrocarbon residue and a polymeric material-degradation-sensitizing group.
    Type: Grant
    Filed: December 8, 1971
    Date of Patent: November 1, 1977
    Assignee: Owens-Illinois, Inc.
    Inventor: Lynn J. Taylor
  • Patent number: 4051306
    Abstract: There is disclosed the preparation of a degradable polymeric material consisting essentially of an organic polymeric base containing a degradation-promoting amount of a partially degraded organic polymer. The organic polymeric base and the degradation-promoting additive may be derived from the same or different polymers. The invention is especially useful in controlling the environmental deterioration of plastics. The rate of deterioration is a function of the environmental conditions such as light, oxygen, and temperature; the concentration of the additive; and the chemical structure(s) of both the base and the additive.
    Type: Grant
    Filed: February 12, 1976
    Date of Patent: September 27, 1977
    Assignee: Owens-Illinois, Inc.
    Inventors: John W. Tobias, Lynn J. Taylor, Stuart J. Gaumer
  • Patent number: 4049618
    Abstract: The use of dicyclopentadienyl iron, or derivatives thereof, in physical mixture with polyvinyl chloride plastics to produce polyvinyl chloride plastic having reduced smoke generating properties.
    Type: Grant
    Filed: September 5, 1974
    Date of Patent: September 20, 1977
    Assignee: Syntex (U.S.A.) Inc.
    Inventor: John J. Kracklauer
  • Patent number: 4048410
    Abstract: There are disclosed novel degradable plastic compositions consisting essentially of an organic polymer containing at least one organic chelating agent. The agent is one which chelates metal so as to form a metal complex which acts to accelerate polymer degradation in the presence of oxygen, electromagnetic radiation, and/or elevated temperature. This invention is especially useful in the preparation of degradable packaging materials such as films, bags, containers, etc.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: September 13, 1977
    Assignee: Owens-Illinois, Inc.
    Inventors: Lynn J. Taylor, John W. Tobias
  • Patent number: 4045388
    Abstract: A novel resin composition is obtained by blending a hydrophilic pullulan with 2 to 98 wt %, based on the total resin weight, of a hydrophobic thermoplastic resin.In case the amount of the thermoplastic resin is 2 to 50 wt %, there is obtained a resin composition consisting essentially of the pullulan which is excellent in water resistance, while in case the amount of the thermoplastic resin is 50 to 98 wt %, there is obtained a resin composition consisting essentially of the thermoplastic resin which has been improved in water and moisture absorptivity.
    Type: Grant
    Filed: February 25, 1975
    Date of Patent: August 30, 1977
    Assignees: Sumitomo Chemical Company, Limited, Hayashibara Biochemical Laboratories, Inc.
    Inventors: Hiroomi Matsunaga, Kozo Tsuji, Teruo Saito
  • Patent number: 4042763
    Abstract: Resin compositions having enhanced photodegradable characteristics are prepared by incorporating minor quantities of a cobalt salt such as cobalt naphthenate in a polymer blend containing at least 90 weight % of a film-forming ethylene polymer, and from about 1 to 10 weight % of a polyethylene-like polymer containing trans carbon-to-carbon double bonds in the polymer chain; such polyethylene-like polymer having been prepared by thermal cracking of specified ethylene-vinyl acetate copolymers under the conditions set forth in U.S. Pat. No. 3,520,955.
    Type: Grant
    Filed: October 8, 1976
    Date of Patent: August 16, 1977
    Assignee: Gulf Research & Development Company
    Inventors: Bert Howard Clampitt, Richard Harry Havens
  • Patent number: 4042765
    Abstract: Plastic compositions containing polyolefins and substituted nitrogen heterocyclic compounds having the formula: ##STR1## wherein X is nitrogen or CH, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are from the group hydrogen; a straight or branched chain alkyl group having from 1 to 6 carbon atoms; cyano; nitro; lower alkoxy; fluorine, dialkylamino, phenyl, halo-phenyl, benzyl and halo-benzyl, have been found to be photodegradable plastic materials for use, for example, as wrapping films and agricultural mulching films.
    Type: Grant
    Filed: October 28, 1976
    Date of Patent: August 16, 1977
    Assignee: Exxon Research and Engineering Co.
    Inventors: Joseph C. Floyd, Don A. Plank
  • Patent number: 4042568
    Abstract: Condensation polymers such as polyamides polyesters, polyurethanes, polyepoxides, polyamide esters, polyureas and polyamino-acids which are photodegradable on exposure to U.V. light, due to the presence in the copolymer backbone of units of structure ##STR1## in small amounts.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: August 16, 1977
    Inventors: James Edwin Guillet, Dan Ervin
  • Patent number: 4042764
    Abstract: Disclosed are photodegradable and thermostable polymeric compositions based on a vinyl or vinylidene polymer such as polyethylene or polypropylene, at least one compound of a transition metal which is soluble in said polymer and which has photodegrading properties with respect to the polymer and at least one halogenated p-quinoid compound.
    Type: Grant
    Filed: June 24, 1975
    Date of Patent: August 16, 1977
    Assignee: Montedison S.p.A.
    Inventors: Francesco Gratani, Marco Binaghi
  • Patent number: 4039731
    Abstract: Polyolefins capable of photodegradation are prepared by incorporating in the polyolefin an additive containing chlorine, bromine, or iodine and either a nitrogen or a sulfur group.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: August 2, 1977
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Bernard Freedman, Martin J. Diamond
  • Patent number: 4038227
    Abstract: Photodegradable hydrocarbon polymers that are susceptible to attack by common microorganisms after exposure to sunlight in a natural atmospheric environment. The polymers include polystyrene and polyethylene polymers and copolymers modified with one or more chemical additives to initiate and to enhance photodegradation.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: July 26, 1977
    Assignee: Bio-Degradable Plastics, Inc.
    Inventors: Carl E. Swanholm, Robert G. Caldwell
  • Patent number: 4038228
    Abstract: There is disclosed a novel degradable plastic composition, said composition being degradable in the absence of electromagnetic radiation and consisting essentially of an organic polymer having dispersed therein at least one transition-metal derivative of at least one highly unsaturated organic acid, such as a tallate, linoleate, linolenate, etc. of one or more transition metals, particularly a transition metal such as cobalt, chromium, copper, iron, manganese, and nickel.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: July 26, 1977
    Assignee: Owens-Illinois, Inc.
    Inventor: Lynn J. Taylor
  • Patent number: 4037034
    Abstract: Plastic compositions containing polyolefins and dinaphthylphthalate compounds having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently are from the group hydrogen; a straight or branched chain alkyl group having from 1 to 6 carbon atoms; cyano; nitro; lower alkoxy; fluorine, dialkylamino, phenyl, halo-phenyl, benzyl and halo-benzyl, have been found to be photodegradable plastic materials for use, for example, as wrapping films and agricultural mulching films.
    Type: Grant
    Filed: October 28, 1976
    Date of Patent: July 19, 1977
    Assignee: Exxon Research and Engineering Company
    Inventor: Don A. Plank
  • Patent number: 4028480
    Abstract: Photodegradable polyethylene or polystyrene compositions of copolymers thereof containing up to 500 ppm of iron in the form of a ferrous carboxylic acid salt having a substituted alkyl chain of at least 6 carbon atoms.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: June 7, 1977
    Assignee: Societe Chimique des Charbonnages - CdF Chimie
    Inventor: Genevieve Le Brasseur
  • Patent number: 4025580
    Abstract: There is disclosed a process for preparing chemically modified styrene polymers and copolymers which comprises treating a polystyrene or a styrene copolymer with an acyl halide in the presence of a Lewis acid so as to introduce ketone groups into the treated polymer or copolymer in an amount sufficient to promote environmental photodegradation of the treated polymer or copolymer. The resulting modified polymers may be used as degradable packaging materials, or as additives to promote the environmental degradation of polystyrene and related materials.
    Type: Grant
    Filed: December 18, 1972
    Date of Patent: May 24, 1977
    Assignee: Owens-Illinois, Inc.
    Inventor: Lynn J. Taylor
  • Patent number: 4024324
    Abstract: A novel composition comprising an aryl ketone, a borate or phosphate ester of an alkanolamine, and a polyolefin, said composition being particularly subject to a controlled degradation.
    Type: Grant
    Filed: December 9, 1975
    Date of Patent: May 17, 1977
    Assignee: UOP Inc.
    Inventor: Allen K. Sparks
  • Patent number: 4021388
    Abstract: A biodegradable composition comprises a synthetic resin, a biodegradable granular filler such as natural starch and preferably a substance autoxidizable to yield a peroxide which attacks the carbon to carbon linkages in the resin.
    Type: Grant
    Filed: March 10, 1976
    Date of Patent: May 3, 1977
    Assignee: Coloroll Limited
    Inventor: Gerald Joseph Louis Griffin
  • Patent number: 4020249
    Abstract: Polyolefins capable of photodegradation are prepared by incorporating in the polyolefin an additive containing chlorine, bromine, or iodine and either a nitrogen or a sulfur group.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: April 26, 1977
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Bernard Freedman, Martin J. Diamond
  • Patent number: 4017668
    Abstract: Polyolefins capable of photodegradation are prepared by incorporating in the polyolefin an additive which contains chlorine, bromine, or iodine directly linked to the nitrogen atom of an amide or imide group.
    Type: Grant
    Filed: April 2, 1976
    Date of Patent: April 12, 1977
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Bernard Freedman, Martin J. Diamond
  • Patent number: 4017666
    Abstract: Polyolefins capable of photodegradation are prepared by incorporating in the polyolefin an additive containing chlorine, bromine, or iodine and either a nitrogen or a sulfur group.
    Type: Grant
    Filed: April 21, 1976
    Date of Patent: April 12, 1977
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Bernard Freedman, Martin J. Diamond