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    BisGMA-free orthodontic adhesives
    3.
    发明授权
    BisGMA-free orthodontic adhesives 有权

    公开(公告)号：US09707159B2

    公开(公告)日：2017-07-18

    申请号：US14898808

    申请日：2014-06-17

    Applicant: UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO

    Inventor： Eira Lopez Palacios ,  Carlos Andres Alvarez Gayosso ,  Gabriel Saez Espinola

    IPC: C08F2/46 ,  C08F2/50 ,  C08G61/04 ,  A61K6/00 ,  A61L24/02 ,  A61L24/06

    CPC classification number: A61K6/0023 ,  A61K6/0008 ,  A61K6/0029 ,  A61K6/0088 ,  A61L24/02 ,  A61L24/06 ,  C08L33/06 ,  C08L33/10

    Abstract: Three adhesives formulated with Trimethylolpropane Trimethacrylate (TMPTMA) that do not contain BisGMA were developed, whereby the mutagenic and teratogenic risk by the release of bisphenol A is eliminated, and presented a better performance compared to the three commercial adhesives prepared with BisGMA (Adhesive A, Adhesive C and Adhesive B). The invention provides an adhesive used in one-step and provides a system which is formed by a primer and a slurry. The adhesives of the invention were compared with two commercial controls. They were physically characterized by assessing: hardening time, adhesion stress, elastic modulus, sorption and solubility at different pHs (6.8 and 7.7); by the obtained values premature detachments, white lesions below the appliance and microfiltration are avoided; its fluidity, film thickness were evaluated and were compared with those obtained from the three commercial adhesives. Storage stability and thermogravimetric analysis were assessed. The prepared adhesives with TMPTMA are photopolymerizables, thereby providing enough time to the operator to place the appliance in proper position, it is easy to handle, capable of supporting orthodontic biomechanics, has low elastic modulus, enables transitions of heavy arches reducing the risk of involuntary detachment of the appliances, have low viscosity, penetrates on both the brace retentions as those made with acid etching on enamel surface. Presenting adhesion to both the base of the attachments as well as to the enamel, its film thickness is minimal and does not alter the prescription system. When the appliance is removed at the end of the treatment, it does not cause structural damage to the enamel because the adhesive remains on the enamel and can be removed easily with a rotary instrument.

    DRIVING SCREW AND CHAIN SPEED REDUCER
    4.
    发明申请
    DRIVING SCREW AND CHAIN SPEED REDUCER 有权
    驱动螺丝和链式减速器

    公开(公告)号：US20160348776A1

    公开(公告)日：2016-12-01

    申请号：US14926999

    申请日：2015-10-29

    Applicant: UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO

    Inventor： Enrique Jaime CHICUREL Y UZIEL ,  Filiberto GUTIERREZ MARTINEZ

    IPC: F16H37/02 ,  F16H25/22

    CPC classification number: F16H37/02 ,  F16G13/06 ,  F16H7/06 ,  F16H25/2204 ,  F16H25/2252 ,  F16H2025/228

    Abstract: An improvement of a worm gear reducer is provided where the output gear is substituted by a threaded chain, which is comprised of nut-like threaded bodies mounted on the extended rods of two endless parallel chains, thus the contact surfaces of the driving screw and the threaded chain is much greater than the contact surfaces of the worm gear reducer, and thus the load capacity and wear resistance are much higher. The screw applies the driving force at the centroid of the contact surface of the threaded chain. There are three embodiments depending of the type of the driving screw which may be either roller, ball or a plain translation screw. With the roller or the ball screws there is rolling contact and thus the efficiency of the present invention is higher than that of the worm gear reducer, which permits it to be used as an amplifier.

    Abstract translation: 提供了一种蜗轮减速器的改进，其中输出齿轮由螺纹链代替，该螺纹链包括安装在两个环形平行链的延伸杆上的螺母状螺纹体，因此驱动螺杆和 螺纹链比蜗轮减速机的接触表面大得多，因此负载能力和耐磨性要高得多。 螺杆将驱动力施加在螺纹链的接触表面的质心处。 根据驱动螺杆的类型可以是辊，球或平移平头螺杆的三个实施例。 在滚子或滚珠丝杠上存在滚动接触，因此本发明的效率高于蜗轮减速器的效率，这允许其用作放大器。

    PROCESS TO OBTAIN IMIDAZOLINE MIXTURES FROM VEGETABLE OILS
    5.
    发明申请
    PROCESS TO OBTAIN IMIDAZOLINE MIXTURES FROM VEGETABLE OILS 审中-公开
    从蔬菜油中获取咪唑啉混合物的方法

    公开(公告)号：US20150315142A1

    公开(公告)日：2015-11-05

    申请号：US14321103

    申请日：2014-07-01

    Applicant: CORROSION Y PROTECCION SA DE CV ,  UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO

    Inventor： Lorenzo Martínez GOMEZ ,  Lorenzo Martínez Martínez DE LA ESCALERA ,  Jorge Antonio Ascencio GUTIERREZ ,  Jose Ignacio Regla CONTRERAS ,  Maria Patricia Shirley Demare NEGRETE

    IPC: C07D207/20 ,  C07C309/04

    Abstract: A method to obtain imidazoline mixtures capable of providing considerable energy savings during the manufacture process due to a notable reduction of process temperature and lower requirements of chemical raw materials, and it allows for the direct use of vegetable oils, instead of fatty acids or their esters, producing imidazolines containing a (2-hydroxyethyl) group on position one of the ring and on position 2, a hydrocarbonated chain, from the fatty acids present in coconut oil, palm oil, jathrofa or castor. Likewise, the application of these mixtures as corrosion inhibitors has been established, in addition to quaternized imidazolines, which have applications as cationic surfactants, fabric softeners, hair conditioners and antistatic agents. It is an optimized method that compared to other known methods, uses substoichiometric proportions of aminoethylethanolamine and lower reaction temperatures, without using dehydrating agents or catalysts, or azeotropic distillation, which involves the use of highly flammable solvents.

    Abstract translation: 一种获得咪唑啉混合物的方法，其能够在制造过程中由于显着降低工艺温度和降低化学原料的要求而提供相当大的能量消耗，并允许直接使用植物油代替脂肪酸或其酯 在椰子油，棕榈油，吉他罗或蓖麻中存在的脂肪酸中产生在环的第1位和位置2上含有（2-羟基乙基）基团的咪唑啉，为烃基链。 同样地，除了具有阳离子表面活性剂，织物软化剂，头发调理剂和抗静电剂的季铵化咪唑啉之外，已经建立了这些混合物作为缓蚀剂的应用。 与其他已知方法相比，使用亚氨基乙醇胺的亚化学计量比例和较低反应温度，而不使用脱水剂或催化剂或共沸蒸馏，这涉及使用高度易燃的溶剂，这是一种优化方法。

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