KR900018247A - 미생물 분해성 플라스틱 제품 생산용 고분자 조성물과 그 제조방법 - Google Patents
미생물 분해성 플라스틱 제품 생산용 고분자 조성물과 그 제조방법 Download PDFInfo
- Publication number
- KR900018247A KR900018247A KR1019900007599A KR900007599A KR900018247A KR 900018247 A KR900018247 A KR 900018247A KR 1019900007599 A KR1019900007599 A KR 1019900007599A KR 900007599 A KR900007599 A KR 900007599A KR 900018247 A KR900018247 A KR 900018247A
- Authority
- KR
- South Korea
- Prior art keywords
- starch
- composition
- ethylene
- polymer composition
- copolymer
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims 22
- 229920000642 polymer Polymers 0.000 title claims 10
- 229920006238 degradable plastic Polymers 0.000 title claims 2
- 230000000813 microbial effect Effects 0.000 title claims 2
- 238000004519 manufacturing process Methods 0.000 title 1
- 229920002472 Starch Polymers 0.000 claims 13
- 239000008107 starch Substances 0.000 claims 13
- 235000019698 starch Nutrition 0.000 claims 12
- 238000009835 boiling Methods 0.000 claims 7
- 239000004014 plasticizer Substances 0.000 claims 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 6
- 239000005977 Ethylene Substances 0.000 claims 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims 6
- 229920001577 copolymer Polymers 0.000 claims 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol group Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims 3
- 239000004202 carbamide Substances 0.000 claims 3
- 238000000034 method Methods 0.000 claims 3
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims 2
- 239000002202 Polyethylene glycol Substances 0.000 claims 2
- 229910021529 ammonia Inorganic materials 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 230000001066 destructive effect Effects 0.000 claims 2
- 235000011187 glycerol Nutrition 0.000 claims 2
- 239000000155 melt Substances 0.000 claims 2
- 229920001223 polyethylene glycol Polymers 0.000 claims 2
- 239000000600 sorbitol Substances 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims 1
- 150000001342 alkaline earth metals Chemical class 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000006378 damage Effects 0.000 claims 1
- QHZOMAXECYYXGP-UHFFFAOYSA-N ethene;prop-2-enoic acid Chemical compound C=C.OC(=O)C=C QHZOMAXECYYXGP-UHFFFAOYSA-N 0.000 claims 1
- 229920001038 ethylene copolymer Polymers 0.000 claims 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims 1
- 229910052738 indium Inorganic materials 0.000 claims 1
- 229920002451 polyvinyl alcohol Polymers 0.000 claims 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
- C08L3/02—Starch; Degradation products thereof, e.g. dextrin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
- C08L23/0861—Saponified vinylacetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0869—Acids or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Materials For Medical Uses (AREA)
- Polyesters Or Polycarbonates (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
내용 없음
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
Claims (19)
- 에틸렌 함량이 10내지 90wt.%이고 용융 유동지수가 2내지 50인 에틸렌/비닐알코올 공중합체와 또한 파괴 전분을 포함하고 미생물 분해성 플라스틱 제품 생산에 이용할 수 있는 고분자 조성물.
- 제1항에 있어서, 공중합체와 전분이 1:19 내지 19:1중량 비율로 들어 있는 고분자 조성물.
- 제1항에 있어서, 공중합체와 전분이 1:4 내지 4:1중량 비율로 들어 있는 고분자 조성물.
- 제1항에 있어서, 또한 전분성분이 0.05 내지 100wt,%농도의 고-비등 가소제를 포함하는 고분자 조성물.
- 제1항에 있어서, 고-비등 가소제의 농도가 전분성분이 20 내지 100wt,%인 고분자 조성물.
- 제4항이나 5항에 있어서, 고-비등 가소제를 글리세린, 폴리에틸렌글리콜, 에틸렌 글리콜, 프로필렌 글리콜, 소르비톨 또한 이들의 혼합물 중에서 선택하여된 고분자 조성물.
- 제1항 내지 6항중 어느 한 항에 있어서, 또한 전분 성분의 2 내지 20wt.%인 요소를 포함하는 조성물.
- 제1항 내지 7항중 어느 한 항에 있어서, 조성물의 전체 중량의 6%까지의 농도로된 물을 포함하는 조성물.
- 제1항 내지 8항중 어느 한 항에 있어서, 변형 에틸렌 공중합체 특히 에틸렌/아크릴산과 그 혼합물중에서 선택되고 조성물의 15wt.%까지인 고분자를 포함하는 조성물.
- 제1항 내지 9항중 어느 한 항에 있어서, 폴리비닐알코올을 포함하는 조성물.
- 제1항 내지 10항중 어느 한 항에 있어서, 또한 조성물의 0.5wt.%까지인 암모니아를 포함하는 조성물.
- 제1항 내지 11항중 어느 한 항에 있어서, 에틸렌/비닐 알코올 공중합체의 에틸렌 함량이 10 내지 40wt.%이고 용융 유동지수가 6 내지 20인 것으로된 조성물.
- 제1항 내지 12항에 따르는 고분자 조성물로 제조한 필름형 제품.
- 제1항 내지 12항에 따르는 고분자 조성물로 제조한 성형 제품.
- 전분 파괴작용을 일으킬 수 있는 충분한 시간동안 충분한 온도로 가열된 압출기내에서 요소, 알칼리-토금속 혹은 알칼리 금속 수산화물중에서 선택된 파괴작용제가 존재하고 전분의 0.05내지 100wt.%인 고-비등 가소제와 함께 1:19 내지 19:1중량비율의 에틸렌/비닐 알코올 공중합체와 전분을 혼합하는 단계를 포함하는 미생물 분해성 플라스틱 제품 생산용 고분자 조성물의 제조방법.
- 제15항에 있어서, 가소제의 비점이하와 또한 120 내지 170℃의 온도에서 일어나는 전분 파괴 현상에 영향을 미치는 요소, 알칼리 또는 알칼리-토 수산화물 또한 그 화합물중에서 선택된 파괴작용제가 존재하고 전분의 0.05내지 100wt.%인 고-비등 가소제와 함께 전분을 120 내지 170℃의 온도로 가열된 압출기속에서 혼합하여 사전 제조된 파괴-전분-기초성분을 다시 에틸렌/비닐 알코올 공중합체와 함께 압출기에서 혼합하는 단계를 포함하는 방법.
- 제15항이나 16항에 있어서, 고-비등 가소제를 글리세린, 폴리에틸렌글리콜, 에틸렌 글리콜, 프로필렌 글리콜, 소르비톨 또한 그 혼합물중에서 선택하여된 방법.
- 제15항에 있어서, 전분성분의 2내지 20wt.%인 파괴 작용제를 첨가하고 전분 성분의 0.05 내지 100wt%인 물을 첨가하면서 혼합하고 또한 물의 농도가 전체 조성물의 6wt.%를 넘지 않는 범위에서 감소하는 것으로된 방법.
- 제16항 내지 18항중 어느 한 항에 있어서, 또한 암모니아를 첨가하여된 방법.※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67413A/89 | 1989-05-30 | ||
IT8967413A IT1233599B (it) | 1989-05-30 | 1989-05-30 | Composizioni polimeriche per la produzione di articoli di materiale plastico biodegradabile e procedimenti per la loro preparazione |
IT67413 | 1989-05-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR900018247A true KR900018247A (ko) | 1990-12-20 |
KR920010645B1 KR920010645B1 (ko) | 1992-12-12 |
Family
ID=11302181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019900007599A KR920010645B1 (ko) | 1989-05-30 | 1990-05-25 | 미생물 분해성 플라스틱 제품 생산용 고분자 조성물과 그 제조방법 |
Country Status (22)
Country | Link |
---|---|
US (1) | US5334634A (ko) |
EP (1) | EP0400532B1 (ko) |
JP (1) | JPH0331333A (ko) |
KR (1) | KR920010645B1 (ko) |
CN (1) | CN1032919C (ko) |
AT (1) | ATE99719T1 (ko) |
AU (1) | AU628175B2 (ko) |
BR (1) | BR9002600A (ko) |
CA (1) | CA2017654C (ko) |
CZ (1) | CZ282950B6 (ko) |
DD (1) | DD298416A5 (ko) |
DE (1) | DE69005702T2 (ko) |
DK (1) | DK0400532T3 (ko) |
ES (1) | ES2062177T3 (ko) |
FI (1) | FI902662A0 (ko) |
HU (1) | HU205963B (ko) |
IL (1) | IL94495A (ko) |
IT (1) | IT1233599B (ko) |
NO (1) | NO179213C (ko) |
PL (1) | PL165399B1 (ko) |
RU (1) | RU2073037C1 (ko) |
TR (1) | TR24428A (ko) |
Families Citing this family (92)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5095054A (en) * | 1988-02-03 | 1992-03-10 | Warner-Lambert Company | Polymer compositions containing destructurized starch |
IT1234783B (it) * | 1989-05-30 | 1992-05-27 | Butterfly Srl | Procedimento per la produzione di composizioni a base di amido destrutturato e composizioni cosi ottenute |
IL94587A (en) * | 1989-06-19 | 1997-04-15 | Novon International | Polymer base blend compositions containing destructurized starch |
IL94966A (en) * | 1989-07-11 | 1994-11-28 | Warner Lambert Co | Polymeric base blend preparations containing starch whose structure has been destroyed |
US5288765A (en) * | 1989-08-03 | 1994-02-22 | Spherilene S.R.L. | Expanded articles of biodegradable plastics materials and a method for their production |
US5409973A (en) * | 1989-08-07 | 1995-04-25 | Butterfly S.R.L. | Polymer composition including destructured starch and an ethylene copolymer |
IT1232910B (it) * | 1989-08-07 | 1992-03-05 | Butterfly Srl | Composizioni polimeriche per la produzione di articoli di materiale plastico biodegradabile e procedimenti per la loro preparazione |
IT1240503B (it) * | 1990-07-25 | 1993-12-17 | Butterfly Srl | Miscela polimerica amidacea particolarmente per la produzione di film e simili e procedimento per la sua produzione. |
IT1242722B (it) * | 1990-08-09 | 1994-05-17 | Butterfly Srl | Film stratificato a matrice amidacea e di bassa permeabilita' e procedimento per la sua produzione. |
IT1245408B (it) * | 1991-02-20 | 1994-09-20 | Butterfly Srl | Composizioni polimeriche biodegradabili a base di amido e di polimero termoplastico |
US5292782A (en) * | 1991-02-20 | 1994-03-08 | Novamont S.P.A. | Biodegradable polymeric compositions based on starch and thermoplastic polymers |
AU656586B2 (en) * | 1991-03-19 | 1995-02-09 | Parke, Davis & Company | Biodegradable compositions comprising starch derivatives |
US5412005A (en) * | 1991-05-03 | 1995-05-02 | Novamont S.P.A. | Biodegradable polymeric compositions based on starch and thermoplastic polymers |
EP0525245A1 (en) * | 1991-08-01 | 1993-02-03 | NOVAMONT S.p.A. | Disposable absorbent articles |
IT1256693B (it) * | 1992-03-10 | 1995-12-12 | Novamont Spa | Composizione polimerica amidacea filmabile, ed articoli sagomati, particolarmente film e foglie ottenibili da tale composizione, aventi elevato effetto barriera e procedimento relativo. |
IT1245485B (it) * | 1991-05-03 | 1994-09-20 | Butterfly Srl | Membrane permselettive e loro impiego |
HU216971B (hu) * | 1991-05-03 | 1999-10-28 | Novamont S.P.A. | Keményítő- és hőrelágyulóműanyag-alapú, biológiailag lebomló polimerkompozíciók |
WO1992020739A1 (en) * | 1991-05-15 | 1992-11-26 | Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha | Biodegradable resin composition and laminated structure made therefrom |
DE4117628C3 (de) * | 1991-05-29 | 1999-02-11 | Inventa Ag | Verfahren und Vorrichtung zur Herstellung von Stärkeschmelze sowie nach diesem Verfahren erhältliche Produkte |
US5217803A (en) * | 1991-06-26 | 1993-06-08 | Tredegar Industries, Inc. | Disposable absorbent articles with biodegradable backsheets |
EP0595859B1 (en) * | 1991-06-26 | 1997-01-22 | The Procter & Gamble Company | Disposable absorbent articles with biodegradable backsheets |
SK147693A3 (en) * | 1991-06-26 | 1994-09-07 | Procter & Gamble | Biodegradable, liquid impervious film |
US5254607A (en) * | 1991-06-26 | 1993-10-19 | Tredegar Industries, Inc. | Biodegradable, liquid impervious films |
US5256711A (en) | 1991-10-04 | 1993-10-26 | Director-General Of Agency Of Industrial Science | Starch-containing biodegradable plastic and method of producing same |
WO1993009184A1 (fr) * | 1991-10-31 | 1993-05-13 | Kabushiki Kaisha Kobe Seiko Sho | Plastique biodegradable |
US5378738A (en) * | 1991-10-31 | 1995-01-03 | Kabushiki Kaisha Kobe Seiko Sho | Biodegradable plastic |
IT1250045B (it) * | 1991-11-07 | 1995-03-30 | Butterfly Srl | Procedimento per la produzione di alcool polivinilico plastificato e suo impiego per la preparazione di composizioni termoplastiche biodegradabili a base di amido. |
IT1250901B (it) * | 1991-12-12 | 1995-04-21 | Novamont Spa | Articoli biodegradabili a base di amido. |
US5635550A (en) * | 1992-02-07 | 1997-06-03 | Solvay (Societe Anonyme) | Starch-based composition |
DE4209095A1 (de) * | 1992-03-20 | 1993-09-23 | Henkel Kgaa | Thermoplastisch verarbeitbare werkstoffe auf staerkebasis, daraus gewonnene formteile und verfahren zu ihrer herstellung |
US5419283A (en) * | 1992-04-08 | 1995-05-30 | Ciuffo Gatto S.R.L. | Animal chew toy of starch material and degradable ethylene copolymer |
US5939467A (en) * | 1992-06-26 | 1999-08-17 | The Procter & Gamble Company | Biodegradable polymeric compositions and products thereof |
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1989
- 1989-05-30 IT IT8967413A patent/IT1233599B/it active
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1990
- 1990-05-23 AU AU55880/90A patent/AU628175B2/en not_active Expired
- 1990-05-24 IL IL9449590A patent/IL94495A/en not_active IP Right Cessation
- 1990-05-25 KR KR1019900007599A patent/KR920010645B1/ko not_active IP Right Cessation
- 1990-05-28 DE DE69005702T patent/DE69005702T2/de not_active Expired - Lifetime
- 1990-05-28 ES ES90110070T patent/ES2062177T3/es not_active Expired - Lifetime
- 1990-05-28 NO NO902348A patent/NO179213C/no unknown
- 1990-05-28 DK DK90110070.1T patent/DK0400532T3/da active
- 1990-05-28 CA CA002017654A patent/CA2017654C/en not_active Expired - Lifetime
- 1990-05-28 TR TR90/0513A patent/TR24428A/xx unknown
- 1990-05-28 EP EP90110070A patent/EP0400532B1/en not_active Expired - Lifetime
- 1990-05-28 AT AT90110070T patent/ATE99719T1/de not_active IP Right Cessation
- 1990-05-29 DD DD90341096A patent/DD298416A5/de not_active IP Right Cessation
- 1990-05-29 RU SU904830150A patent/RU2073037C1/ru active
- 1990-05-29 FI FI902662A patent/FI902662A0/fi not_active Application Discontinuation
- 1990-05-29 HU HU903240A patent/HU205963B/hu not_active IP Right Cessation
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- 1990-05-29 CN CN90103240A patent/CN1032919C/zh not_active Expired - Lifetime
- 1990-05-29 PL PL90285383A patent/PL165399B1/pl unknown
- 1990-05-29 BR BR909002600A patent/BR9002600A/pt not_active IP Right Cessation
- 1990-05-29 JP JP2139543A patent/JPH0331333A/ja active Granted
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