CN105802097A - Method for manufacturing PVB film by recycling waste PVB material - Google Patents
Method for manufacturing PVB film by recycling waste PVB material Download PDFInfo
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- CN105802097A CN105802097A CN201610313093.2A CN201610313093A CN105802097A CN 105802097 A CN105802097 A CN 105802097A CN 201610313093 A CN201610313093 A CN 201610313093A CN 105802097 A CN105802097 A CN 105802097A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/164—Aluminum halide, e.g. aluminium chloride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The invention relates to a method for manufacturing a PVB film by recycling a waste PVB material. The preparation method is simple; the prepared PVB film has relatively small difference from the PVB film produced by a pure PVB raw material, and can be applied to production of sandwich glass; the performance stability is good; and the production cost is relatively low.
Description
Technical field
The present invention relates to the recovery process of a kind of waste or used plastics, be specifically related to the cycling and reutilization technique of a kind of waste polyethylene butyral thin film, belong to cycling and reutilization technical field of macromolecules.
Background technology
A kind of available sandwich mode that polyvinyl butyral resin (PVB) material is American scientist invention is clipped in the macromolecular material between two-layer simple glass, its a kind of polymer formed with butyraldehyde condensation reaction by high-molecular polyivnyl alcohol (PVA), white Powdered.U.S. government's legislation demands in 1938 uses the PVB base material doing motor vehicles front windshield.Through years of researches exploitation and practice, pvb film is still the production irreplaceable raw material of glass sandwich.
At present, quickly growing of China's automobile and laminated glass for building, coloured PVB film demand is also increasing, product different colours conversion in production process, thickness conversion can produce substantial amounts of useless diaphragm, laminated glass manufacturer also has a certain amount of tailing and produces, traditional recovery method is relatively low to the value of PVB, PVB film is carried out the method complex process of desolventing technology recycling, relatively costly, this invention simplifies step, reduce cost, PVB film is as the laminated glass-use film of a kind of high added value, pure material is expensive with the thin film of plasticizer blending extrusion, although the film produced with regeneration PVB material is less costly, but poor-performing.
Chinese patent application (CN101074297A) discloses the discoloration method of a kind of waste PVB plastic, A) waste PVB plastic is dosed in the reaction unit of sealing, adding solvent and carry out Leaching reaction, described solvent volume ML:PVB plastic quality G is 1～10；B) pigment solution leached is discharged from reaction unit；Pigment solution is carried out decompression distillation, recycling design；Described solvent is phthalate, phosphoric acid lipid, fatty acid lipid or and their mixture.This invention is only the pigment dissolution of waste PVB plastic decoloured just as the standard reclaimed, and the standard whether reaching pure PVB plastics of the PVB plastics after reclaiming then has no way of investigating, and more is used for manufacturing PVB film without reference to by useless PVB plastics.
Summary of the invention
In order to overcome drawbacks described above of the prior art, the invention provides the method that a kind of waste PVB material circulation recycling manufactures PVB film, this PVB film is multiple layers of molds structure, stability is good, make use of the value of PVB waste material efficiently, and simplify processing step, further reduce cost.
The present invention is for reaching its technical purpose, and the technical scheme of employing is as follows:
The method that waste PVB material circulation of the present invention recycling manufactures PVB film, comprises the steps:
1). pulverizing waste PVB material (waste PVB material preferred size: the broken diaphragm of the long wide 0.8～1.5cm of 0.8～1.5cm), stirring and dissolving after addition decolorising agent, discharge pigment solution and obtain one-level decolouring PVB waste material, be subsequently adding decolorising agent repeat the above steps and carry out multistage desolventing technology until obtaining colourless PVB waste material；
2). elimination step 1) pigment solution of the colourless PVB scraped surface of gained, and carry out vacuum drying；
3). using step 2) colourless PVB waste material after vacuum drying and the extruded machine extrusion of the plasticizer A layer to structure die head as PVB film；
4). extrude the B layer to structure die head as PVB film through extruder after pure PVB resin being mixed with plasticizer；
5). by step 3), 4) structure die head flows out A layer and B layer gained slab, namely cooling obtains pvb film.
Further, step 1) after also comprise the steps:
2a). pigment is discharged solution and is reused through decompression distillation；Described step 2) 10-5Pa～10-2When pa coarse vacuum, dried in the environment that temperature is 40 DEG C.
As a preferred embodiment of the present invention, step 1) in PVB powder particle, decolorising agent add in the reaction unit sealed according to mass ratio 1:4～6, stir to be discharged by pigment solution after 30～45min under normal temperature condition and to obtain one-level decolouring PVB waste material；The interpolation quality carrying out decolorising agent during multistage desolventing technology is identical with first time addition.
As a preferred embodiment of the present invention, it is characterised in that step 3) in the interpolation mass ratio of colourless PVB waste material after vacuum drying and plasticizer be: 80～90:10～20；Step 4) in pure PVB resin mix according to the ratio of 50～60:40～50 with plasticizer.
As a preferred embodiment of the present invention, it is characterised in that described step 1) described in waste PVB material excessive film of color conversion in coloured waste PVB film or PVB film production process；Described step 3), step 4) in plasticizer be 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid) ester, adipic acid, SA dibutyl ester or SA dioctyl ester one or more mixing.
More preferably, described step 1) described in decolorising agent select adsorption and sedimentation class decolorising agent and the composite use of adsorbent resin, described adsorption and sedimentation class decolorising agent is one or more mixing in activated alumina, polyaluminium chloride, kieselguhr, and described adsorbent resin is one or more mixing of dibutyl phthalate, phosphoglyceride, ethyl acrylate.
Preferably, described decolorising agent is that adsorption and sedimentation class decolorising agent is composite according to the mass ratio of 20～40:60～80 with adsorbent resin.
A kind of detailed description of the invention as the present invention, described step 3), step 4) in adopt double screw extruder, described double screw extruder processing temperature is: the dog-house of described extruder is to the temperature 110～135 DEG C of fuselage, die head temperature 130～135 DEG C.
Further, described step 3) and step 4) in structure die head be A/B/A structure die head or A/B structure die head, described step 5) A layer is 2～5:5～8 with the mass ratio of B layer compound in gained pvb film.
Obtained its thickness of PVB film of preparation method of the present invention is 0.38mm～1.52mm, and fracture elongation is 220%～280%, and hot strength is 24Mpa～30Mpa, and light transmittance is more than 88%, and mist degree is less than or equal to 0.8%.
Technical scheme provided by the invention has the advantages that
1, the present invention selects decolorising agent directly to extrude after PVB film carries out desolventing technology and produces PVB film to structure die head, simplifies traditional desolventing technology pelletize and deposits the step of dry extrusion masking, reduces production cost.
2, the present invention adopts pure PVB to have the PVB film of multiple layers of molds with regeneration PVB material preparation, reduce the masking cost of PVB film, and the PVB film of preparation is better than the PVB film properties that other reworked material produces, less with the PVB film properties difference of pure PVB raw material production, can well meeting the user demand of client, market competition advantage is obvious.
Detailed description of the invention
The PVB manufacturers such as the pure PVB resin in embodiment 1～3 is hydrops company of Japan, du pont company, Shou Nuo company of the U.S., Kuraray company of Germany provide.(the pure PVB resin of purchase, molecular weight 30～45K, density 1.07g/cm3, softening temperature 60～65 DEG C).The quality of each component in embodiment 1～3 can be kilogram or kilogram.
Below in conjunction with embodiment, technical scheme is described further:
Embodiment 1
1) the waste and old coloured PVB material after pulverizing, activated alumina, phosphoglyceride being joined by 1:1:4 mass ratio in the agitator tank of sealing, at the temperature of 45 DEG C, agitated 30min obtains one-level decolouring PVB waste material, speed of agitator 20r/min；Above step repeats to obtain for twice the PVB waste material of three grades of desolventing technology；
2) pigment solution of elimination three grades decolouring PVB scraped surface, then 10-5Pa～10-2Under pa coarse vacuum, the environment that temperature is 40 DEG C obtains after dried 30min dried PVB powder fragment；
3) the colourless PVB powder fragment after vacuum drying is extruded A layer to A/B/A structure die head as PVB film according to the ratio of 85:15 through vented twin-screw extruder with 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid) ester, vented twin-screw extruder spout is to body temperature 115～130 DEG C, die head temperature 130～135 DEG C；
4) the B layer to A/B/A structure die head as PVB film is extruded through double screw extruder after the pure PVB resin bought being mixed according to the ratio of 60:40 with 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid) ester, double screw extruder spout is to body temperature 115～130 DEG C, die head temperature 130～135 DEG C.
5) by step 4), 5) die head flow out A layer, B layer slab, namely cooling obtains pvb film, the B layer mass ratio of the A layer and pure PVB that wherein regenerate PVB is the summation that 20:80, A layer refers to two A layer quality of PVB film (A/B/A structure mould).
Obtained pvb film is carried out performance detection, and it is the results detailed in Table 1.
Embodiment 2
1) the waste and old coloured PVB material after pulverizing, polyaluminium chloride, dibutyl phthalate being joined by 2:5:7 mass ratio in the agitator tank of sealing, at the temperature of 45 DEG C, agitated 30min obtains one-level decolouring PVB waste material, speed of agitator 20r/min；Above step repeats to obtain three grades of decolouring PVB waste materials for twice；
2) pigment solution of elimination three grades decolouring PVB scraped surface, then waste material is 10-5Pa～10-2Under pa coarse vacuum, the environment that temperature is 40 DEG C obtains after dried 30min dried PVB powder fragment；
3) the colourless PVB powder fragment after vacuum drying is extruded A layer to A/B/A structure die head as PVB film according to the ratio of 80:20 through vented twin screw with 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid), vented twin-screw extruder spout is to body temperature 115～130 DEG C, die head temperature 130～135 DEG C；
4) the B layer to A/B/A structure die head as PVB film is extruded through vented twin-screw extruder after the pure PVB resin bought being mixed according to the ratio of 55:45 with 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid) ester, vented twin-screw extruder extruder spout is to body temperature 115～130 DEG C, die head temperature 130～135 DEG C；
5) by step 4), 5) die head flow out A layer, B layer slab, namely cooling obtains pvb film, the B stratum proportion of the A layer and pure PVB that wherein regenerate PVB is the summation that 30:70, A layer refers to two A layer quality of PVB film (A/B/A structure mould).
Obtained pvb film is carried out performance detection, and it is the results detailed in Table 1.
Embodiment 3
1) the waste and old coloured PVB material after pulverizing, polyaluminium chloride, phosphoglyceride being joined by 1:1:3 mass ratio in the agitator tank of sealing, at the temperature of 45 DEG C, agitated 30min obtains one-level decolouring pvb film, speed of agitator 20r/min；Above step repeats to obtain three grades of decolouring pvb films for twice；
2) pigment solution of elimination three grades decolouring PVB scraped surface, then 10-5Pa～10-2Under pa coarse vacuum, the environment that temperature is 40 DEG C obtains after dried 30min dried PVB powder fragment；
3) using the colourless PVB powder fragment after vacuum drying and 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid) according to the ratio of 90:10 through twin-screw extrusion to A/B/A structure die head as the A layer of PVB film, twin screw spout is to body temperature 115～130 DEG C, die head temperature 130～135 DEG C；
4) the B layer to A/B structure die head as PVB film is extruded through double screw extruder after the pure PVB resin bought being mixed according to the ratio of 50:50 with 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid) ester, double screw extruder spout is to body temperature 115～130 DEG C, die head temperature 130～135 DEG C；
5) by step 4), 5) die head flow out A layer, B layer slab, namely cooling obtains pvb film, the B layer mass ratio of the A layer and pure PVB that wherein regenerate PVB is the summation that 40:60, A layer refers to two A layer quality of PVB film (A/B/A structure mould).
Obtained pvb film is carried out performance detection, and it is the results detailed in Table 1.
Table 1PVB diaphragm performance detection data
By above performance test it can be seen that adopt waste PVB material circulation recycling to manufacture gained PVB film, its stability is good, less with the PVB film properties difference of pure PVB raw material production, make use of the value of PVB waste material efficiently, and simplify processing step, further reduce cost.
It addition, the PVB film that embodiment 1～3 prepares has good caking property with laminated glass, for the production of laminated glass.Tested by ball falling impact, the condition of ball falling impact test: according to GB9962-1999 requirement, with 630g steel ball, laminated glass is done ball falling impact stripping performance testing experiment, after testing: only occur that the fracture of interlayer film or exposed does not occur in the fracture of glass.
The above, it it is only presently preferred embodiments of the present invention, not the present invention is done any pro forma restriction, therefore all contents without departing from technical solution of the present invention, the technical spirit of the foundation present invention, to any simple modification made for any of the above embodiments, equivalent variations and modification, all still falls within the scope of technical solution of the present invention.
Claims (10)
1. the method that a waste PVB material circulation recycling manufactures PVB film, it is characterised in that comprise the steps:
1). pulverizing waste PVB material, stirring and dissolving after addition decolorising agent, to discharge pigment solution and obtain one-level decolouring PVB waste material, be subsequently adding decolorising agent, repeat the above steps carries out multistage desolventing technology until obtaining colourless PVB waste material；
2). elimination step 1) pigment solution of the colourless PVB scraped surface of gained, and carry out vacuum drying；
3). using step 2) colourless PVB waste material after vacuum drying and the extruded machine extrusion of the plasticizer A layer to structure die head as PVB film；
4). extrude the B layer to structure die head as PVB film through extruder after pure PVB resin being mixed with plasticizer；
5). by step 3), 4) die head flows out A layer and B layer slab, cools down and obtain pvb film.
2. method according to claim 1, it is characterised in that step 1) after also comprise the steps:
2a). pigment is discharged solution and is reused through decompression distillation；Described step 2) 10-5Pa～10-2When pa coarse vacuum, dried in the environment that temperature is 40 DEG C.
3. method according to claim 1, it is characterized in that, step 1) in PVB powder particle, decolorising agent add in the reaction unit sealed according to mass ratio 1:4～6, stir to be discharged by pigment solution after 30～45min under normal temperature condition and to obtain one-level decolouring PVB waste material；The interpolation quality carrying out decolorising agent during multistage desolventing technology is identical with first time addition.
4. method according to claim 1, it is characterised in that step 3) in the interpolation mass ratio of colourless PVB waste material after vacuum drying and plasticizer be: 80～90:10～20；Step 4) in pure PVB resin mix according to the ratio of 50～60:40～50 with plasticizer.
5. the method according to any one in claim 1-4, it is characterised in that described step 1) described in waste PVB material excessive film of color conversion in coloured waste PVB film or PVB film production process；Described step 3), step 4) in plasticizer be in 2,2'-ethylenedioxybis(ethanol). two (2 ethyl hexanoic acid) ester, adipic acid, SA dibutyl ester or SA dioctyl ester one or more mixing.
6. the method according to any one in claim 1-4, it is characterized in that, described step 1) described decolorising agent selects adsorption and sedimentation class decolorising agent and the composite use of adsorbent resin, described adsorption and sedimentation class decolorising agent is one or more mixing in activated alumina, aluminium polychlorid, kieselguhr, and described adsorbent resin is one or more mixing in dibutyl phthalate, phosphoglyceride, ethyl acrylate.
7. method according to claim 6, described decolorising agent is that adsorption and sedimentation class decolorising agent is composite according to the mass ratio of 20～40:60～80 with adsorbent resin.
8. the method according to any one in claim 1-4, it is characterized in that, described step 3), step 4) in adopt vented twin-screw extruder, described vented twin-screw extruder processing temperature is: the dog-house of described extruder is to the temperature 110～135 DEG C of fuselage, die head temperature 130～135 DEG C.
9. the method according to any one in claim 1-4, it is characterized in that, described step 3) and step 4) in structure die head be A/B/A structure die head or A/B structure die head, described step 5) A layer is 2～5:5～8 with the mass ratio of B layer compound in gained pvb film.
10. the method according to any one in claim 1-4, it is characterised in that described step 5) to obtain PVB film thickness be 0.38mm～1.52mm, fracture elongation is 220%～280%, hot strength is 24Mpa～30Mpa, and light transmittance is more than 88%, and mist degree is less than or equal to 0.8%.
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| CN201610313093.2A CN105802097A (en) | 2016-05-11 | 2016-05-11 | Method for manufacturing PVB film by recycling waste PVB material |
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| CN201610313093.2A Pending CN105802097A (en) | 2016-05-11 | 2016-05-11 | Method for manufacturing PVB film by recycling waste PVB material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022098237A1 (en) | 2020-11-04 | 2022-05-12 | Redeahold Apeldoorn B.V. | Upgrading recycled polyvinyl butyral |
| WO2022150528A1 (en) * | 2021-01-11 | 2022-07-14 | Solutia Inc. | A method of recycling poly(vinyl butyral) from multilayer poly(vinyl butyral) sheets |
| WO2024006630A1 (en) * | 2022-06-29 | 2024-01-04 | Solutia Inc. | Method of recycling poly(vinyl butyral) from multilayer poly(vinyl butyral) sheets |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022098237A1 (en) | 2020-11-04 | 2022-05-12 | Redeahold Apeldoorn B.V. | Upgrading recycled polyvinyl butyral |
| WO2022150528A1 (en) * | 2021-01-11 | 2022-07-14 | Solutia Inc. | A method of recycling poly(vinyl butyral) from multilayer poly(vinyl butyral) sheets |
| WO2024006630A1 (en) * | 2022-06-29 | 2024-01-04 | Solutia Inc. | Method of recycling poly(vinyl butyral) from multilayer poly(vinyl butyral) sheets |
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Application publication date: 20160727 |