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    PROMOTED MEMBRANE FOR SINGLE-PLY ROOFING
    1.
    发明申请
    PROMOTED MEMBRANE FOR SINGLE-PLY ROOFING 审中-公开

    公开(公告)号：US20200032043A1

    公开(公告)日：2020-01-30

    申请号：US16594556

    申请日：2019-10-07

    Applicant: STEPAN COMPANY ,  CARLISLE INTANGIBLE COMPANY

    Inventor： Warren KAPLAN ,  Sarah WOLEK ,  Mike HEISHMAN ,  William SCHNEIDER

    IPC: C08L23/16 ,  E04D1/20 ,  E04D1/34

    Abstract: A promoted membrane suitable for use in single-ply roofing applications is disclosed. The membrane comprises EPDM rubber and 0.1 to 10 wt. % of an adhesion promoter. The promoter comprises a polyester resin having a hydroxyl number within the range of 28 to 250 mg KOH/g, a content of terephthalate recurring units within the range of 40 to 65 wt. % based on the amount of polyester resin, and a glass-transition temperature within the range of 40° C. to 80° C. Roofing systems comprising the promoted EPDM membranes are also disclosed. Compared with an unpromoted membrane, the promoted membranes provide a substantial and unexpected boost in peel strength such that the roofing systems resist weather-induced failure of the bond between the roofing membrane and the roof substrate. The invention helps roofers minimize or limit the aggravation and cost of warranty claims from customers whose buildings and contents may otherwise be damaged or destroyed by exposure to wind and/or rain.

    POLYOL BLENDS AND RIGID FOAMS WITH IMPROVED LOW-TEMPERATURE R-VALUES
    2.
    发明申请
    POLYOL BLENDS AND RIGID FOAMS WITH IMPROVED LOW-TEMPERATURE R-VALUES 有权

    公开(公告)号：US20210024744A1

    公开(公告)日：2021-01-28

    申请号：US17066741

    申请日：2020-10-09

    Applicant: STEPAN COMPANY

    Inventor： Warren A. KAPLAN ,  Zhenhua CUI ,  Sarah WOLEK

    IPC: C08L67/03 ,  C08J9/14 ,  C08G18/73 ,  C08G18/42

    Abstract: Blends comprising an aromatic polyester polyol and a 1 to 10 wt. % of a fatty acid derivative are disclosed. The fatty acid derivative is a C8 to C18 fatty acid ester or a C8 to C18 fatty acid amide. Also disclosed are rigid PU or PU-PIR foams that comprise a reaction product of water, a catalyst, a foam-stabilizing surfactant, a polyisocyanate, a blowing agent, and the polyester polyol/fatty acid derivative blends. Surprisingly, low-temperature R-values of rigid foams based on pentane blowing agents can be improved significantly by using blends of aromatic polyester polyols and a minor proportion of readily available fatty acid derivatives. In some aspects, the difference between initial R-values of the foam measured at 75° F. and 40° F. is at least 5% greater than that of a similar foam prepared in the absence of the fatty acid derivative.

    SOLID-SOLID PHASE-CHANGE MATERIALS
    3.
    发明申请
    SOLID-SOLID PHASE-CHANGE MATERIALS 审中-公开

    公开(公告)号：US20200377646A1

    公开(公告)日：2020-12-03

    申请号：US16994220

    申请日：2020-08-14

    Applicant: STEPAN COMPANY

    Inventor： Zhenhua CUI ,  Warren A. KAPLAN ,  Sarah WOLEK

    IPC: C08G59/06 ,  C08G63/06 ,  C08G65/34 ,  C08J9/00

    Abstract: Polyether- or polyester-epoxide polymer (PEEP) compositions are disclosed. The compositions comprise reaction products of a polyepoxide compound and a polyol composition. The polyol composition has a melting point within the range of 20° C. to 100° C. and a hydroxyl number less than 35 mg KOH/g. The PEEP composition is a solid-solid phase-change material. As measured by differential scanning calorimetry (DSC) at a heating/cooling rate of 10° C./minute, the PEEP composition has a transition temperature within the range of −10° C. to 70° C., a latent heat at the transition temperature within the range of 30 to 200 J/g, and little or no detectable hysteresis or supercooling upon thermal cycling over at least five heating/cooling cycles that encompass the transition temperature. The PEEP compositions should enable formulators to manage thermal energy changes in many practical applications, including automotive, marine or aircraft parts, building materials, appliance insulation, electronics, textiles, garments, and paints or coatings.

    POLYESTER DIVERTING AGENTS FOR LOW-TEMPERATURE OIL WELLS
    5.
    发明申请
    POLYESTER DIVERTING AGENTS FOR LOW-TEMPERATURE OIL WELLS 有权

    公开(公告)号：US20220251441A1

    公开(公告)日：2022-08-11

    申请号：US17617729

    申请日：2020-06-15

    Applicant: STEPAN COMPANY

    Inventor： Douglas Kip HILLSHAFER ,  Sarah WOLEK

    IPC: C09K8/72 ,  C09K8/88 ,  C09K8/68

    Abstract: A hydraulic fracturing method for recovering oil from a low-temperature subterranean oil formation is disclosed. Before, during, or after inducing hydraulic fracturing within the formation, a particulate, degradable polyester diverting agent is introduced into the formation in an amount effective to improve oil production from the formation. The diverting agent is allowed to degrade, and oil is recovered. The diverting agent has a melting point greater than the average temperature of the formation and is selected from: (i) ethylene glycol succinates; (ii) acid-terminated ethylene glycol succinates; (iii) acid-terminated polyglycolic acids; (iv) acid-terminated polylactic acids; (v) mixtures of any of (i) through (iv) with a half acid ester; and (vi) mixtures of polylactic acids or polyglycolic acids with a half acid ester. These easily synthesized classes of particulate polyester diverting agents degrade more effectively than polylactides under the conditions present in low-temperature wells and should help to enhance well productivity.

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