公开(公告)号：US20240182665A1

公开(公告)日：2024-06-06

申请号：US18285684

申请日：2022-04-05

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Ajmir Khan ,  Zahra Aayanifard ,  Muhammad Naveed

IPC: C08J11/24 ,  B01J31/02 ,  B01J31/22 ,  C07C29/128 ,  C07C67/475 ,  C08J11/14 ,  C08J11/28

CPC classification number: C08J11/24 ,  B01J31/0237 ,  B01J31/2226 ,  C07C29/1285 ,  C07C67/475 ,  C08J11/14 ,  C08J11/28 ,  B01J2231/005 ,  B01J2531/26 ,  C08J2367/02 ,  C08J2367/04 ,  C08J2377/06

Abstract: The disclosure relates to a method for chemically recycling a condensation polymer, which includes melt-processing a mixture including a condensation polymer and an internal catalyst to increase the amorphous content of the polymer, followed by depolymerizing polymer in a reaction medium with a reactive solvent. Melt-processing and quenching of a condensation polymer generally reduces the crystalline content of the polymer and correspondingly increases the amorphous content of the polymer, which makes the polymer more amenable to subsequent depolymerization. Inclusion of the internal catalyst, for example a volatile organic catalyst, during melt-processing not only improves the relative degree of amorphization during melt-processing, but it also enhances the rate and conversion of the depolymerization stage that would otherwise be rate-limited by mass transport of an external catalyst from the bulk reaction medium to the polymer surface for depolymerization.

公开(公告)号：US20220259360A1

公开(公告)日：2022-08-18

申请号：US17624652

申请日：2020-07-03

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Muhammad Naveed

IPC: C08F283/12 ,  C09D5/16 ,  C08F2/50

Abstract: The disclosure generally relates to omniphobic compatibilizers, which include a polymerization reaction product between a first vinyl monomer, optionally a second vinyl crosslinking monomer, and a functionalized omniphobic polymer. The functionalized omniphobic polymer can include two or more vinyl functional groups or at least one free radical initiator functional group such that the reaction product forming the omniphobic compatibilizer can be a vinyl or free-radical polymerization product. The omniphobic compatibilizer can be incorporated into a UV-curable or a non-UV-curable thermoset omniphobic composition. The UV-curable composition can be a crosslinked polymerization reaction product between the omniphobic compatibilizer, a third vinyl monomer, and a fourth polyvinyl crosslinking monomer. The non-UV-curable composition can be a crosslinked polymerization reaction product between the omniphobic compatibilizer, a first thermosetting component, and a second thermosetting component. The thermoset omniphobic composition can be a coating on a substrate in a corresponding coated article.

公开(公告)号：US20220162402A1

公开(公告)日：2022-05-26

申请号：US17532610

申请日：2021-11-22

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Muhammad Naveed

IPC: C08J3/24 ,  C08L51/06 ,  C08J11/18 ,  C08K5/14 ,  C08K5/053 ,  C08K5/20 ,  C08K5/1539 ,  C08K5/00

Abstract: The disclosure relates to thermally reversibly crosslinked polyolefins (TRC-PO) and methods for making the same. A TRC-PO can be formed by reactive melt-processing a mixture including (i) a polyolefin, (ii) an initiator, and (iii) a reversible crosslinker. The reversible crosslinker includes (A) a grafting agent moiety selected from unsaturated cyclic anhydrides, unsaturated cyclic imides, cyclic nitroxides, and ring-opened analogs thereof, and (B) a crosslinking moiety bound to the cyclic grafting agent moiety. This reactive melt-processing, for example including reactive extrusion, forms a thermally reversibly crosslinked (TRC) polyolefin with polyolefin chains reversibly crosslinked via the reversible crosslinkers, which provide dynamic covalent bonds, such as siloxanes and esters, that are amenable to melt re-processing to re-from or otherwise re-use the TRC-PO while still retaining the reversible crosslinks after re-processing. Catalysts and additives such as rheology modifiers can be added to the melt-processing mixture.

公开(公告)号：US20240132651A1

公开(公告)日：2024-04-25

申请号：US18278200

申请日：2022-02-22

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Muhammad Naveed

IPC: C08F299/00 ,  C08F255/02 ,  C08L23/06

CPC classification number: C08F299/00 ,  C08F255/023 ,  C08L23/06 ,  C08F2438/02 ,  C08L2205/025 ,  C08L2205/03 ,  C08L2205/08 ,  C08L2207/062

Abstract: The disclosure relates to the functionalization of a carbon-carbon backbone (CCB) polymer using a (cyclic) grafting agent, an initiator, and optionally a reversible radical trapping agent. The grafting agent and/or initiator can be particularly selected in terms of their surface energy and/or half-life, respectively, to limit or control undesirable effects associated with reactive melt-processing, such as excessive crosslinking, chain scission, or grafting agent homopolymerization, as well as to improve or control desirable effects associated with reactive melt-processing, such as improved relative graft uniformity or homogeneity on the CCB polymer. In some cases, the grafting agent can further include a functional group to impart some additional or new chemical or physical property to the CCB polymer. In some cases, the reactively melt-processed mixture includes two or more different polymers that are compatibilized via the grafting agent.

公开(公告)号：US11746176B2

公开(公告)日：2023-09-05

申请号：US17624652

申请日：2020-07-03

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Muhammad Naveed

IPC: C08F2/50 ,  C08F283/12 ,  C09D5/16

CPC classification number: C08F283/124 ,  C08F2/50 ,  C09D5/1675

Abstract: The disclosure generally relates to omniphobic compatibilizers, which include a polymerization reaction product between a first vinyl monomer, optionally a second vinyl crosslinking monomer, and a functionalized omniphobic polymer. The functionalized omniphobic polymer can include two or more vinyl functional groups or at least one free radical initiator functional group such that the reaction product forming the omniphobic compatibilizer can be a vinyl or free-radical polymerization product. The omniphobic compatibilizer can be incorporated into a UV-curable or a non-UV-curable thermoset omniphobic composition. The UV-curable composition can be a crosslinked polymerization reaction product between the omniphobic compatibilizer, a third vinyl monomer, and a fourth polyvinyl crosslinking monomer. The non-UV-curable composition can be a crosslinked polymerization reaction product between the omniphobic compatibilizer, a first thermosetting component, and a second thermosetting component. The thermoset omniphobic composition can be a coating on a substrate in a corresponding coated article.

公开(公告)号：US12018136B2

公开(公告)日：2024-06-25

申请号：US17532610

申请日：2021-11-22

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Muhammad Naveed

IPC: C08K5/14 ,  C08J3/24 ,  C08J11/18 ,  C08K5/00 ,  C08K5/053 ,  C08K5/1539 ,  C08K5/20 ,  C08L51/06

CPC classification number: C08J3/243 ,  C08J11/18 ,  C08K5/0025 ,  C08K5/053 ,  C08K5/14 ,  C08K5/1539 ,  C08K5/20 ,  C08L51/06 ,  C08J2323/06 ,  C08J2323/12 ,  C08L2207/062 ,  C08L2312/00 ,  C08L2314/00

Abstract: The disclosure relates to thermally reversibly crosslinked polyolefins (TRC-PO) and methods for making the same. A TRC-PO can be formed by reactive melt-processing a mixture including (i) a polyolefin, (ii) an initiator, and (iii) a reversible crosslinker. The reversible crosslinker includes (A) a grafting agent moiety selected from unsaturated cyclic anhydrides, unsaturated cyclic imides, cyclic nitroxides, and ring-opened analogs thereof, and (B) a crosslinking moiety bound to the cyclic grafting agent moiety. This reactive melt-processing, for example including reactive extrusion, forms a thermally reversibly crosslinked (TRC) polyolefin with polyolefin chains reversibly crosslinked via the reversible crosslinkers, which provide dynamic covalent bonds, such as siloxanes and esters, that are amenable to melt re-processing to re-from or otherwise re-use the TRC-PO while still retaining the reversible crosslinks after re-processing. Catalysts and additives such as rheology modifiers can be added to the melt-processing mixture.

公开(公告)号：US20240228689A9

公开(公告)日：2024-07-11

申请号：US18278200

申请日：2022-02-22

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Muhammad Naveed

IPC: C08F299/00 ,  C08F255/02 ,  C08L23/06

CPC classification number: C08F299/00 ,  C08F255/023 ,  C08L23/06 ,  C08F2438/02 ,  C08L2205/025 ,  C08L2205/03 ,  C08L2205/08 ,  C08L2207/062

Abstract: The disclosure relates to the functionalization of a carbon-carbon backbone (CCB) polymer using a (cyclic) grafting agent, an initiator, and optionally a reversible radical trapping agent. The grafting agent and/or initiator can be particularly selected in terms of their surface energy and/or half-life, respectively, to limit or control undesirable effects associated with reactive melt-processing, such as excessive crosslinking, chain scission, or grafting agent homopolymerization, as well as to improve or control desirable effects associated with reactive melt-processing, such as improved relative graft uniformity or homogeneity on the CCB polymer. In some cases, the grafting agent can further include a functional group to impart some additional or new chemical or physical property to the CCB polymer. In some cases, the reactively melt-processed mixture includes two or more different polymers that are compatibilized via the grafting agent.

公开(公告)号：US20230028815A1

公开(公告)日：2023-01-26

申请号：US17785993

申请日：2020-12-17

Applicant: BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY

Inventor： Muhammad Rabnawaz ,  Muhammad Naveed

IPC: C09D5/00 ,  C09D133/14 ,  C09D133/08

Abstract: The disclosure relates to a thermoset omniphobic composition with favorable dirt repellency and water resistance properties. The composition can be used as a protective coating on a substrate. Such coatings, when contacted with soil, dirt, dust, etc., remain clean and transparent. The omniphobic composition generally includes a thermoset polymer, an omniphobic polymer, and a filler or nanofiller. The thermoset polymer can be a crosslinked acrylate or other vinyl polymer. The omniphobic polymer can include fluorocarbon and/or siloxane groups for improving water resistance. The nanofiller can include nanosilica and/or nanoclay. The thermoset polymer and the omniphobic polymer together form a matrix for the filler as a dispersed phase throughout the matrix. A coated substrate with the thermoset omniphobic composition thereon exhibits favorable water contact and sliding angles as well as favorable transparency values in dirt accumulation tests.