An embodiment relates to a polythiol composition for a plastic lens. The polythiol composition for a plastic lens according to the embodiment can produce a clear and transparent plastic lens by way of polymerizing such raw materials as a polythiol compound, an isocyanate, a photoactive color correcting agent, and the like, followed by a simple post-process such as irradiation of ultraviolet rays. In addition, since the process for preparing the lens is simple and economical, the lens is advantageously used for manufacturing various plastic lenses such as eyeglass lenses and camera lenses.

An embodiment relates to a polythiol composition for a plastic lens. The polythiol composition for a plastic lens according to the embodiment can produce a clear and transparent plastic lens by way of polymerizing such raw materials as a polythiol compound, an isocyanate, a photoactive color correcting agent, and the like, followed by a simple post-process such as irradiation of ultraviolet rays. In addition, since the process for preparing the lens is simple and economical, the lens is advantageously used for manufacturing various plastic lenses such as eyeglass lenses and camera lenses.

Disclosed herein are polyurethane compositions and methods for reprocessing cross-linked polyurethane compositions. The polyurethane composition comprises a network polymer and a polyurethane exchange catalyst permeated within the network polymer. The network polymer comprises a dynamic network formed from an isocyanate constitutional unit and a second constitution unit having a hydroxyl group capable of reacting with an isocyanate group of the isocyanate constitutional unit to form a urethane bond. The catalyst comprises a metal atom and a ligand coordinated to the metal atom.

Disclosed herein are polyurethane compositions and methods for reprocessing cross-linked polyurethane compositions. The polyurethane composition comprises a network polymer and a polyurethane exchange catalyst permeated within the network polymer. The network polymer comprises a dynamic network formed from an isocyanate constitutional unit and a second constitution unit having a hydroxyl group capable of reacting with an isocyanate group of the isocyanate constitutional unit to form a urethane bond. The catalyst comprises a metal atom and a ligand coordinated to the metal atom.

A modification method of a polyurethane, including the steps of: preparing a polyurethane having an ethylenically unsaturated bond; and treating the polyurethane with a liquid containing a compound having a conjugated double bond, or a modification method of a polyurethane, including the steps of: preparing a polyurethane having a conjugated double bond; and treating the polyurethane with a liquid containing a compound having an ethylenically unsaturated bond is used.

This invention falls within the biomedical glue and intelligent manufacturing technical domain, offering a method and system for preparing a polyurethane-based soft tissue bioadhesive. The method involves obtaining a viscosity measurement value using a viscometer during the acquisition of an aliphatic polyurethane prepolymer crucial for soft tissue bioadhesive preparation. An industrial digital camera captures a vessel image, and a miscellaneous offset sequence is calculated from the image. The adjustment expansion degree is then computed based on the viscosity measurement value and the miscellaneous offset sequence. The reaction process is ultimately controlled in conjunction with the adjustment expansion degree, utilizing a side reaction to observe characteristics caused by impurities through a color change. This approach enables the observation of side reaction characteristics, enhancing the accuracy of predicting the reaction progress endpoint. Synchronous monitoring of multiple reaction vessels optimizes adjustment time, significantly reducing productivity waste and improving production efficiency.

This invention falls within the biomedical glue and intelligent manufacturing technical domain, offering a method and system for preparing a polyurethane-based soft tissue bioadhesive. The method involves obtaining a viscosity measurement value using a viscometer during the acquisition of an aliphatic polyurethane prepolymer crucial for soft tissue bioadhesive preparation. An industrial digital camera captures a vessel image, and a miscellaneous offset sequence is calculated from the image. The adjustment expansion degree is then computed based on the viscosity measurement value and the miscellaneous offset sequence. The reaction process is ultimately controlled in conjunction with the adjustment expansion degree, utilizing a side reaction to observe characteristics caused by impurities through a color change. This approach enables the observation of side reaction characteristics, enhancing the accuracy of predicting the reaction progress endpoint. Synchronous monitoring of multiple reaction vessels optimizes adjustment time, significantly reducing productivity waste and improving production efficiency.

The present document provides methods for post-polymerization modification of polymer backbones. In particular, the methods described in this document relate to transformation of polyesters and polyurethanes via [3,3]-sigmatropic rearrangement. Polymer compounds containing backbones modified post-polymerization are also provided, along with various methods of using these polymers in a variety of segments of the economy.

The present document provides methods for post-polymerization modification of polymer backbones. In particular, the methods described in this document relate to transformation of polyesters and polyurethanes via [3,3]-sigmatropic rearrangement. Polymer compounds containing backbones modified post-polymerization are also provided, along with various methods of using these polymers in a variety of segments of the economy.

In a process for the production of pore-free polyurethane elastomer moldings with Shore D hardness of at least 60 in accordance with DIN 53505, (a) polyesterdiol with OH number from 20 to 100 mg KOH/g and (b) a chain extender composed of diol with molar mass below 300 g/mol, is mixed with (c) isocyanate prepolymers obtainable via reaction of diisocyanate with polyesterols with functionality from 1.95 to 2.2 and with OH number from 20 to 200 mg KOH/g to form a reaction mixture. The reaction mixture is charged to a mold and hardened to form the polyurethane elastomer. Polyurethane elastomer moldings are thus obtainable by this process, and these polyurethane moldings may be used as cladding component for commercial vehicles, bodywork component in vehicle construction, or a cladding component of a machine installation.